1
|
Juan A, Segrelles C, del Campo-Balguerías A, Bravo I, Silva I, Peral J, Ocaña A, Clemente-Casares P, Alonso-Moreno C, Lorz C. Anti-EGFR conjugated nanoparticles to deliver Alpelisib as targeted therapy for head and neck cancer. Cancer Nanotechnol 2023. [DOI: 10.1186/s12645-023-00180-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023] Open
Abstract
Abstract
Background
Head and neck squamous cell carcinoma (SCC) is one of the most prevalent and deadly cancers worldwide. Even though surgical approaches, radiation therapy, and therapeutic agents are commonly used, the prognosis of this cancer remains poor, with a tendency towards recurrence and metastasis. Current targeted therapeutic options for these patients are limited to monoclonal antibodies against EGFR or PD-1 receptors. Thus, there is an urgent need to introduce new molecularly targeted therapies for treating head and neck SCC. EGFR can be used as a target to improve the ability of nanoparticles to bind to tumor cells and deliver chemotherapeutic agents. In fact, over 90% of head and neck SCCs overexpress EGFR, and other tumor types, such as colorectal and glioblastoma, show EGFR overexpression. The PI3K/mTOR signaling pathway is one of the most commonly altered oncogenic pathways in head and neck SCC. Alpelisib is a specific PI3Kα inhibitor indicated for PIK3CA mutant advanced breast cancer that showed promising activity in clinical trials in head and neck SCC. However, its use is associated with dose-limiting toxicities and treatment-related adverse effects.
Results
We generated polylactide (PLA) polymeric nanoparticles conjugated to anti-EGFR antibodies via chemical cross-linking to a polyethyleneimine (PEI) coating. Antibody-conjugated nanoparticles (ACNP) displayed low polydispersity and high stability. In vivo, ACNP showed increased tropism for EGFR-expressing head and neck tumors in a xenograft model compared to non-conjugated nanoparticles (NP). Alpelisib-loaded nanoparticles were homogeneous, stable, and showed a sustained drug release profile. Encapsulated Alpelisib inhibited PI3K pathway activation in the different cell lines tested that included wild type and altered PIK3CA. Alpelisib-NP and Alpelisib-ACNP decreased by 25 times the half-maximal inhibitory concentration compared to the free drug and increased the bioavailability of the drug in the cells. Herein we propose an efficient strategy to treat head and neck SCC based on nanotechnology.
Conclusions
Anti-EGFR-conjugated polymeric nanoparticles are an effective delivery system to increase drug efficiency and bioavailability in head and neck cancer cells. This strategy can help reduce drug exposure in disease-free organs and decrease drug-associated unwanted side effects.
Collapse
|
2
|
Baker GJ, White AJP, Casely IJ, Grainger D, Crimmin MR. Catalytic, Z-Selective, Semi-Hydrogenation of Alkynes with a Zinc-Anilide Complex. J Am Chem Soc 2023; 145:7667-7674. [PMID: 36972405 PMCID: PMC10080692 DOI: 10.1021/jacs.3c02301] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
Abstract
The reversible activation of dihydrogen with a molecular zinc anilide complex is reported. The mechanism of this reaction has been probed through stoichiometric experiments and density functional theory (DFT) calculations. The combined evidence suggests that H2 activation occurs by addition across the Zn-N bond via a four-membered transition state in which the Zn and N atoms play a dual role of Lewis acid and Lewis base. The zinc hydride complex that results from H2 addition has been shown to be remarkably effective for the hydrozincation of C═C bonds at modest temperatures. The scope of hydrozincation includes alkynes, alkenes, and a 1,3-butadiyne. For alkynes, the hydrozincation step is stereospecific leading exclusively to the syn-isomer. Competition experiments show that the hydrozincation of alkynes is faster than the equivalent alkene substrates. These new discoveries have been used to develop a catalytic system for the semi-hydrogenation of alkynes. The catalytic scope includes both aryl- and alkyl-substituted internal alkynes and proceeds with high alkene: alkane, Z:E ratios, and modest functional group tolerance. This work offers a first example of selective hydrogenation catalysis using zinc complexes.
Collapse
Affiliation(s)
- Greg J Baker
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, 82 Wood Lane, White City, London W12 0BZ, United Kingdom
| | - Andrew J P White
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, 82 Wood Lane, White City, London W12 0BZ, United Kingdom
| | - Ian J Casely
- Johnson Matthey Technology Centre, Blounts Court, Sonning Common, Reading RG4 9NH, United Kingdom
| | - Damian Grainger
- Johnson Matthey, 28 Cambridge Science Park, Milton Road, Cambridge CB4 0FP, United Kingdom
| | - Mark R Crimmin
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, 82 Wood Lane, White City, London W12 0BZ, United Kingdom
| |
Collapse
|
3
|
Mandel MJ, Krieck S, Görls H, Westerhausen M. Bulky Hybrid
C‐
Scorpionate/Amidinate Complexes of Lithium and Zinc. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Miles J. Mandel
- Institute of Inorganic and Analytical Chemistry Chair of Inorganic Chemistry I Friedrich Schiller University Jena Humboldtstraße 8 07743 Jena Germany
| | - Sven Krieck
- Institute of Inorganic and Analytical Chemistry Chair of Inorganic Chemistry I Friedrich Schiller University Jena Humboldtstraße 8 07743 Jena Germany
| | - Helmar Görls
- Institute of Inorganic and Analytical Chemistry Chair of Inorganic Chemistry I Friedrich Schiller University Jena Humboldtstraße 8 07743 Jena Germany
| | - Matthias Westerhausen
- Institute of Inorganic and Analytical Chemistry Chair of Inorganic Chemistry I Friedrich Schiller University Jena Humboldtstraße 8 07743 Jena Germany
| |
Collapse
|
4
|
Cao F, Wang Y, Wang X, Zhang W, Solan GA, Wang R, Ma Y, Hao X, Sun WH. Zinc 8-aminotrihydroquinolines appended with pendant N-diphenylphosphinoethyl arms as exceptionally active catalysts for the ROP of ε-CL. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00979j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Through activation with LiCH2SiMe3 or LiN(SiMe3)2, zinc(ii) chloride complexes bearing 5,6,7-trihydroquinolin-8-amines appended with pendant diphenyl phosphine units displayed remarkable catalytic activity for ROP of ε-caprolactone.
Collapse
Affiliation(s)
- Furong Cao
- Beijing Key Laboratory of Clothing Materials R&D and Assessment, Beijing Engineering Research Center of Textile Nanofiber, School of Materials Science and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Yun Wang
- Beijing Key Laboratory of Clothing Materials R&D and Assessment, Beijing Engineering Research Center of Textile Nanofiber, School of Materials Science and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Xing Wang
- Beijing Key Laboratory of Clothing Materials R&D and Assessment, Beijing Engineering Research Center of Textile Nanofiber, School of Materials Science and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Wenjuan Zhang
- Beijing Key Laboratory of Clothing Materials R&D and Assessment, Beijing Engineering Research Center of Textile Nanofiber, School of Materials Science and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China
| | - Gregory A. Solan
- Department of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, UK
| | - Rui Wang
- Beijing Key Laboratory of Clothing Materials R&D and Assessment, Beijing Engineering Research Center of Textile Nanofiber, School of Materials Science and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China
| | - Yanping Ma
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Xiang Hao
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Wen-Hua Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| |
Collapse
|
5
|
Estupiñán Ó, Niza E, Bravo I, Rey V, Tornín J, Gallego B, Clemente-Casares P, Moris F, Ocaña A, Blanco-Lorenzo V, Rodríguez-Santamaría M, Vallina-Álvarez A, González MV, Rodríguez A, Hermida-Merino D, Alonso-Moreno C, Rodríguez R. Mithramycin delivery systems to develop effective therapies in sarcomas. J Nanobiotechnology 2021; 19:267. [PMID: 34488783 PMCID: PMC8419920 DOI: 10.1186/s12951-021-01008-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Accepted: 08/20/2021] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Sarcomas comprise a group of aggressive malignancies with very little treatment options beyond standard chemotherapy. Reposition of approved drugs represents an attractive approach to identify effective therapeutic compounds. One example is mithramycin (MTM), a natural antibiotic which has demonstrated a strong antitumour activity in several tumour types, including sarcomas. However, its widespread use in the clinic was limited by its poor toxicity profile. RESULTS In order to improve the therapeutic index of MTM, we have loaded MTM into newly developed nanocarrier formulations. First, polylactide (PLA) polymeric nanoparticles (NPs) were generated by nanoprecipitation. Also, liposomes (LIP) were prepared by ethanol injection and evaporation solvent method. Finally, MTM-loaded hydrogels (HG) were obtained by passive loading using a urea derivative non-peptidic hydrogelator. MTM-loaded NPs and LIP display optimal hydrodynamic radii between 80 and 105 nm with a very low polydispersity index (PdI) and encapsulation efficiencies (EE) of 92 and 30%, respectively. All formulations show a high stability and different release rates ranging from a fast release in HG (100% after 30 min) to more sustained release from NPs (100% after 24 h) and LIP (40% after 48 h). In vitro assays confirmed that all assayed MTM formulations retain the cytotoxic, anti-invasive and anti-stemness potential of free MTM in models of myxoid liposarcoma, undifferentiated pleomorphic sarcoma and chondrosarcoma. In addition, whole genome transcriptomic analysis evidenced the ability of MTM, both free and encapsulated, to act as a multi-repressor of several tumour-promoting pathways at once. Importantly, the treatment of mice bearing sarcoma xenografts showed that encapsulated MTM exhibited enhanced therapeutic effects and was better tolerated than free MTM. CONCLUSIONS Overall, these novel formulations may represent an efficient and safer MTM-delivering alternative for sarcoma treatment.
Collapse
Affiliation(s)
- Óscar Estupiñán
- Sarcomas and Experimental Therapeutics Laboratory, Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Hospital Universitario Central de Asturias, Avenida de Roma, s/n, 33011, Oviedo, Spain.,Instituto Universitario de Oncología del Principado de Asturias, 33011, Oviedo, Spain.,CIBER en Oncología (CIBERONC), 28029, Madrid, Spain
| | - Enrique Niza
- Centro Regional de Investigaciones Biomédicas, Unidad NanoCRIB, 02008, Albacete, Spain.,Universidad de Castilla-La Mancha, Facultad de Farmacia de Albacete, 02008, Albacete, Spain
| | - Iván Bravo
- Centro Regional de Investigaciones Biomédicas, Unidad NanoCRIB, 02008, Albacete, Spain.,Universidad de Castilla-La Mancha, Facultad de Farmacia de Albacete, 02008, Albacete, Spain
| | - Verónica Rey
- Sarcomas and Experimental Therapeutics Laboratory, Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Hospital Universitario Central de Asturias, Avenida de Roma, s/n, 33011, Oviedo, Spain.,Instituto Universitario de Oncología del Principado de Asturias, 33011, Oviedo, Spain
| | - Juan Tornín
- Sarcomas and Experimental Therapeutics Laboratory, Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Hospital Universitario Central de Asturias, Avenida de Roma, s/n, 33011, Oviedo, Spain.,Instituto Universitario de Oncología del Principado de Asturias, 33011, Oviedo, Spain.,Materials Science and Engineering Department, Universitat Politècnica de Catalunya (UPC), Escola d'Enginyeria Barcelona Est (EEBE), 08019, Barcelona, Spain.,Institut de Recerca Sant Joan de Déu, 08034, Barcelona, Spain
| | - Borja Gallego
- Sarcomas and Experimental Therapeutics Laboratory, Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Hospital Universitario Central de Asturias, Avenida de Roma, s/n, 33011, Oviedo, Spain
| | - Pilar Clemente-Casares
- Universidad de Castilla-La Mancha, Facultad de Farmacia de Albacete, 02008, Albacete, Spain.,Centro Regional de Investigaciones Biomédicas (CRIB), UCLM, 02008, Albacete, Spain
| | | | - Alberto Ocaña
- CIBER en Oncología (CIBERONC), 28029, Madrid, Spain.,Experimental Therapeutics Unit, Hospital Clínico San Carlos, IdISSC, 28040, Madrid, Spain
| | - Verónica Blanco-Lorenzo
- Sarcomas and Experimental Therapeutics Laboratory, Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Hospital Universitario Central de Asturias, Avenida de Roma, s/n, 33011, Oviedo, Spain.,Servicio de Anatomía Patológica, Hospital Universitario Central de Asturias, 33011, Oviedo, Spain
| | - Mar Rodríguez-Santamaría
- Sarcomas and Experimental Therapeutics Laboratory, Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Hospital Universitario Central de Asturias, Avenida de Roma, s/n, 33011, Oviedo, Spain
| | - Aitana Vallina-Álvarez
- Instituto Universitario de Oncología del Principado de Asturias, 33011, Oviedo, Spain.,Servicio de Anatomía Patológica, Hospital Universitario Central de Asturias, 33011, Oviedo, Spain
| | - M Victoria González
- Sarcomas and Experimental Therapeutics Laboratory, Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Hospital Universitario Central de Asturias, Avenida de Roma, s/n, 33011, Oviedo, Spain.,Instituto Universitario de Oncología del Principado de Asturias, 33011, Oviedo, Spain.,CIBER en Oncología (CIBERONC), 28029, Madrid, Spain.,Departamento de Cirugía, Universidad de Oviedo, 33006, Oviedo, Spain
| | - Aida Rodríguez
- Sarcomas and Experimental Therapeutics Laboratory, Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Hospital Universitario Central de Asturias, Avenida de Roma, s/n, 33011, Oviedo, Spain
| | - Daniel Hermida-Merino
- Netherlands Organisation for Scientific Research (NWO), DUBBLE@ESRF, 38000, Grenoble, France
| | - Carlos Alonso-Moreno
- Centro Regional de Investigaciones Biomédicas, Unidad NanoCRIB, 02008, Albacete, Spain. .,Universidad de Castilla-La Mancha, Facultad de Farmacia de Albacete, 02008, Albacete, Spain.
| | - René Rodríguez
- Sarcomas and Experimental Therapeutics Laboratory, Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Hospital Universitario Central de Asturias, Avenida de Roma, s/n, 33011, Oviedo, Spain. .,Instituto Universitario de Oncología del Principado de Asturias, 33011, Oviedo, Spain. .,CIBER en Oncología (CIBERONC), 28029, Madrid, Spain.
| |
Collapse
|
6
|
Efficient Bulky Organo-Zinc Scorpionates for the Stereoselective Production of Poly( rac-lactide)s. Polymers (Basel) 2021; 13:polym13142356. [PMID: 34301114 PMCID: PMC8309543 DOI: 10.3390/polym13142356] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 07/14/2021] [Accepted: 07/16/2021] [Indexed: 11/17/2022] Open
Abstract
The direct reaction of the highly sterically demanding acetamidinate-based NNN'-scorpionate protioligand Hphbptamd [Hphbptamd = N,N'-di-p-tolylbis(3,5-di-tertbutylpyrazole-1-yl)acetamidine] with one equiv. of ZnMe2 proceeds in high yield to the mononuclear alkyl zinc complex [ZnMe(κ3-phbptamd)] (1). Alternatively, the treatment of the corresponding lithium precursor [Li(phbptamd)(THF)] with ZnCl2 yielded the halide complex [ZnCl(κ3-phbptamd)] (2). The X-ray crystal structure of 1 confirmed unambiguously a mononuclear entity in these complexes, with the zinc centre arranged with a pseudotetrahedral environment and the scorpionate ligand in a κ3-coordination mode. Interestingly, the inexpensive, low-toxic and easily prepared complexes 1 and 2 resulted in highly efficient catalysts for the ring-opening polymerisation of lactides, a sustainable bio-resourced process industrially demanded. Thus, complex 1 behaved as a single-component robust initiator for the living and immortal ROP of rac-lactide under very mild conditions after a few hours, reaching a TOF value up to 5520 h-1 under bulk conditions. Preliminary kinetic studies revealed apparent zero-order dependence on monomer concentration in the absence of a cocatalyst. The PLA materials produced exhibited narrow dispersity values, good agreement between the experimental Mn values and monomer/benzyl alcohol ratios, as well as enhanced levels of heteroselectivity, reaching Ps values up to 0.74.
Collapse
|
7
|
Improvement in zinc complexes bearing Schiff base in ring-opening polymerization of ε-caprolactone: A five-membered ring system. POLYMER 2019. [DOI: 10.1016/j.polymer.2019.121812] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
|
8
|
Luna Barros M, Cushion MG, Schwarz AD, Turner ZR, Mountford P. Magnesium, calcium and zinc [N 2N'] heteroscorpionate complexes. Dalton Trans 2019; 48:4124-4138. [PMID: 30638242 DOI: 10.1039/c8dt04985h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new family of sterically demanding N2N' heteroscorpionate pro-ligands (HC(tBu2pz)2SiMe2N(H)R (R = iPr, tBu, Ph, Xyl)) has been prepared via a straightforward modular synthetic route. An extensive study into the synthesis and characterisation of lithium, magnesium, calcium and zinc complexes supported by both 3,5-tBu and 3,5-Me substituted N2N' ligand families has been conducted. Attempted deprotonation of the pro-ligands with nBuLi afforded the corresponding lithium salts Li{HC(tBu2pz)2SiMe2NR} (R = iPr (1), tBu (2), Ph (3) and Xyl (4)) but air- and thermal-sensitivity limited the yields of these potentially useful precursors; only the sterically encumbered ligand system allowed clean reactivity. Magnesium methyl complexes Mg{HC(tBu2pz)2SiMe2NR}Me (R = iPr (5) and R = Ph (6)) were prepared using an excess of the Grignard reagent MeMgCl. Magnesium butyl complexes were synthesised in good yields using the dialkyl precursor MgnBu2 to afford Mg{HC(R'2pz)2SiMe2NR}nBu (R' = Me; R = iPr (7), tBu (8), Ad (9), Ph (10). R' = tBu; R = iPr (11), Ph (12)). Protonolylsis reactions were used to synthesise magnesium and calcium amide complexes Mg{HC(R'2pz)2SiMe2NR}{N(SiHMe2)2} (R' = Me; R = iPr (13), tBu (14), Ph (15). R' = tBu; R = Ph (16)) or Mg{HC(R'2pz)2SiMe2NR}{N(SiMe3)2} (R' = Me; R = iPr (17), tBu (18), Ph (19). R' = tBu; R = Ph (20)), and Ca{HC(R'2pz)2SiMe2NR}{N(SiMe2)2} (L) (R' = Me; L = thf; R = iPr (21), tBu (22), Ph (23). R' = tBu; L = none; R = Ph (24). Zinc methyl complexes Zn{HC(R'2pz)2SiMe2NR}Me (R' = Me; R = iPr (25), tBu (26), Ph (27). R' = tBu; R = Ph (28)) were prepared by reaction of the N2N' heteroscorpionate pro-ligands with ZnMe2. In preliminary studies, magnesium amide complexes 16 and 20 were evaluated as initiators for the ring-opening polymerisation (ROP) of ε-caprolactone (ε-CL) and rac-lactide (rac-LA). Although the overall polymerisation control was poor, 16 and 20 were found to be active initiators.
Collapse
Affiliation(s)
- Mariana Luna Barros
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, UK.
| | | | | | | | | |
Collapse
|
9
|
Coulton JB, Smith AC, Wheeler KA, Semeniuc RF. Multiple coordination modes of a new ditopic bis(pyrazolyl)methane-based ligand. Dalton Trans 2018; 47:17109-17121. [PMID: 30465668 DOI: 10.1039/c8dt03992e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
A new ditopic ligand, N-(2,2-bis(pyrazolyl)ethyl)-2,2-bis(pyrazolyl)acetamide ((pz)2CH-C(O)-NH-CH2-CH(pz)2, L4Pz, pz = pyrazolyl ring), comprising two bis(pyrazolyl)methane donor groups linked via an amide bridge, has been prepared from the reaction of HOOCCH(pz)2 and H2NCH2CH(pz)2. The ligand coordinates to various metallic salts (i.e. AgO3SCF3, PdCl2, Re(CO)5Br, and Fe(BF4)2), in either a κ2-μ-κ2 or a κ3-μ-κ2 fashion, depending on the coordination preferences of the metallic center. These compounds were characterized by NMR, UV-Vis and IR spectroscopy, and in solid state by single crystal X-ray diffraction. In the case of silver(i), a mono-dimensional coordination polymer was obtained, while the others were found to be discrete complexes. The synthesis and characterization of a heterobimetallic complex is also described. In solid state, all compounds are associated into supramolecular architectures via hydrogen bonding and pyrazolyl embrace interactions.
Collapse
Affiliation(s)
- John B Coulton
- Department of Chemistry and Biochemistry, Eastern Illinois University, Charleston, Illinois 61920, USA.
| | - Aramis C Smith
- Department of Chemistry and Biochemistry, Eastern Illinois University, Charleston, Illinois 61920, USA.
| | - Kraig A Wheeler
- Department of Chemistry, Whitworth University, Spokane, Washington 99251, USA
| | - Radu F Semeniuc
- Department of Chemistry and Biochemistry, Eastern Illinois University, Charleston, Illinois 61920, USA.
| |
Collapse
|
10
|
Alkorta I, Claramunt RM, Díez-Barra E, Elguero J, de la Hoz A, López C. The organic chemistry of poly(1 H -pyrazol-1-yl)methanes. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.03.011] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
11
|
Martínez A, Moreno-Blázquez S, Rodríguez-Diéguez A, Ramos A, Fernández-Galán R, Antiñolo A, Carrillo-Hermosilla F. Simple ZnEt2as a catalyst in carbodiimide hydroalkynylation: structural and mechanistic studies. Dalton Trans 2017; 46:12923-12934. [DOI: 10.1039/c7dt02700a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Simple ZnEt2is an efficient catalyst for the addition of terminal alkynes to carbodiimides, through amidinate complexes, and consecutive isocyanate addition and intramolecular cyclohydroamination.
Collapse
Affiliation(s)
- Antonio Martínez
- Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Dpto. de Química Inorgánica
- Orgánica y Bioquímica
- Facultad de Ciencias y Tecnologías Químicas
- Universidad de Castilla-La Mancha
| | - Sonia Moreno-Blázquez
- Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Dpto. de Química Inorgánica
- Orgánica y Bioquímica
- Facultad de Ciencias y Tecnologías Químicas
- Universidad de Castilla-La Mancha
| | | | - Alberto Ramos
- Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Dpto. de Química Inorgánica
- Orgánica y Bioquímica
- Facultad de Ciencias y Tecnologías Químicas
- Universidad de Castilla-La Mancha
| | - Rafael Fernández-Galán
- Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Dpto. de Química Inorgánica
- Orgánica y Bioquímica
- Facultad de Ciencias y Tecnologías Químicas
- Universidad de Castilla-La Mancha
| | - Antonio Antiñolo
- Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Dpto. de Química Inorgánica
- Orgánica y Bioquímica
- Facultad de Ciencias y Tecnologías Químicas
- Universidad de Castilla-La Mancha
| | - Fernando Carrillo-Hermosilla
- Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Dpto. de Química Inorgánica
- Orgánica y Bioquímica
- Facultad de Ciencias y Tecnologías Químicas
- Universidad de Castilla-La Mancha
| |
Collapse
|
12
|
Pettinari C, Pettinari R, Marchetti F. Golden Jubilee for Scorpionates. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2016. [DOI: 10.1016/bs.adomc.2016.01.002] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
|
13
|
Akpan ED, Ojwach SO, Omondi B, Nyamori VO. Zn(ii) and Cu(ii) formamidine complexes: structural, kinetics and polymer tacticity studies in the ring-opening polymerization of ε-caprolactone and lactides. NEW J CHEM 2016. [DOI: 10.1039/c5nj03159a] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The flexibility of ligands and their coordination chemistry with metal centers provided effective catalysts in the ring opening polymerization of cyclic esters.
Collapse
Affiliation(s)
- Ekemini D. Akpan
- School of Chemistry and Physics
- Westville Campus
- University of KwaZulu-Natal
- Private Bag X54001
- Durban
| | - Stephen O. Ojwach
- School of Chemistry and Physics
- Pietermaritzburg Campus
- University of KwaZulu-Natal
- Private Bag X01
- Scottsville
| | - Bernard Omondi
- School of Chemistry and Physics
- Westville Campus
- University of KwaZulu-Natal
- Private Bag X54001
- Durban
| | - Vincent O. Nyamori
- School of Chemistry and Physics
- Westville Campus
- University of KwaZulu-Natal
- Private Bag X54001
- Durban
| |
Collapse
|
14
|
Castro-Osma JA, Alonso-Moreno C, Lara-Sánchez A, Otero A, Fernández-Baeza J, Sánchez-Barba LF, Rodríguez AM. Catalytic behaviour in the ring-opening polymerisation of organoaluminiums supported by bulky heteroscorpionate ligands. Dalton Trans 2015; 44:12388-400. [PMID: 25534594 DOI: 10.1039/c4dt03475a] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of alkyl organoaluminium complexes based on bulky heteroscorpionate ligands were designed as catalysts for the ring-opening polymerisation of cyclic esters. Thus, the treatment of AlX3 (X = Me, Et) with bulky acetamide or thioacetamide heteroscorpionate ligands nbptamH (1) [nbptamH = N-naphthyl-2,2-bis(3,5-dimethylpyrazol-1-yl)thioacetamide], fbpamH (2) [fbpamH = N-fluorenyl-2,2-bis(3,5-dimethylpyrazol-1-yl)acetamide], ptbptamH (3) [ptbptamH = N-phenyl-2,2-bis(3,5-di-tert-butylpyrazol-1-yl)thioacetamide], ntbptamH (4) [ntbptamH = N-naphthyl-2,2-bis(3,5-di-tert-butylpyrazol-1-yl)thioacetamide], ptbpamH (5) [ptbpamH = N-phenyl-2,2-bis(3,5-di-tert-butylpyrazol-1-yl)acetamide] and (S)-mtbpamH (6) [(S)-mtbpamH = (S)-(−)-N-α-methylbenzyl-2,2-bis(3,5-di-tert-butylpyrazol-1-yl)acetamide] for 1 hour at 0 °C afforded the dialkyl aluminium complexes [AlX2{κ(2)-nbptam}] (X = Me 7, Et 8), [AlX2{κ(2)-fbpam}] (X = Me 9, Et 10), [AlX2{κ(2)-ptbptam}] (X = Me 11, Et 12), [AlX2{κ(2)-ntbptam}] (X = Me 13, Et 14), [AlX2{κ2(-)ptbpam}] (X = Me 15, Et 16) and [AlX2{κ(2)-(S)-mtbpam}] (X = Me 17, Et 18). The structures of the complexes were determined by spectroscopic methods and the X-ray crystal structure of 14 was also established. The alkyl-containing aluminium complexes 7–18 can act as efficient single-component initiators for the ring-opening polymerisation of ε-caprolactone and rac-lactide. The polymerisations are living, as evidenced by the narrow polydispersities of the isolated polymers and the linear nature of the number average molecular weight versus conversion plot. Finally, a comparative study of ring-opening polymerisation for new bulky heteroscorpionate aluminium initiators and the less congested aluminium analogues is reported.
Collapse
Affiliation(s)
- Jose A Castro-Osma
- Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha, 13071-Ciudad Real, Spain.
| | | | | | | | | | | | | |
Collapse
|
15
|
Honrado M, Otero A, Fernández-Baeza J, Sánchez-Barba LF, Garcés A, Lara-Sánchez A, Martínez-Ferrer J, Sobrino S, Rodríguez AM. New Racemic and Single Enantiopure Hybrid Scorpionate/Cyclopentadienyl Magnesium and Zinc Initiators for the Stereoselective ROP of Lactides. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00248] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Manuel Honrado
- Departamento de Química Inorgánica,
Orgánica y Bioquímica−Centro de Innovación
en Química Avanzada (ORFEO−CINQA), Campus Universitario, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
| | - Antonio Otero
- Departamento de Química Inorgánica,
Orgánica y Bioquímica−Centro de Innovación
en Química Avanzada (ORFEO−CINQA), Campus Universitario, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
| | - Juan Fernández-Baeza
- Departamento de Química Inorgánica,
Orgánica y Bioquímica−Centro de Innovación
en Química Avanzada (ORFEO−CINQA), Campus Universitario, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
| | - Luis F. Sánchez-Barba
- Departamento de Biología y Geología, Física
y Química Inorgánica, Universidad Rey Juan Carlos, Móstoles, 28933 Madrid, Spain
| | - Andrés Garcés
- Departamento de Biología y Geología, Física
y Química Inorgánica, Universidad Rey Juan Carlos, Móstoles, 28933 Madrid, Spain
| | - Agustín Lara-Sánchez
- Departamento de Química Inorgánica,
Orgánica y Bioquímica−Centro de Innovación
en Química Avanzada (ORFEO−CINQA), Campus Universitario, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
| | - Jaime Martínez-Ferrer
- Departamento de Química Inorgánica,
Orgánica y Bioquímica−Centro de Innovación
en Química Avanzada (ORFEO−CINQA), Campus Universitario, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
| | - Sonia Sobrino
- Departamento de Química Inorgánica,
Orgánica y Bioquímica−Centro de Innovación
en Química Avanzada (ORFEO−CINQA), Campus Universitario, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
| | - Ana M. Rodríguez
- Departamento de Química Inorgánica,
Orgánica y Bioquímica−Centro de Innovación
en Química Avanzada (ORFEO−CINQA), Campus Universitario, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
| |
Collapse
|
16
|
Mou Z, Liu B, Wang M, Xie H, Li P, Li L, Li S, Cui D. Isoselective ring-opening polymerization of rac-lactide initiated by achiral heteroscorpionate zwitterionic zinc complexes. Chem Commun (Camb) 2014; 50:11411-4. [DOI: 10.1039/c4cc05033a] [Citation(s) in RCA: 96] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
17
|
Honrado M, Otero A, Fernández-Baeza J, Sánchez-Barba LF, Garcés A, Lara-Sánchez A, Rodrı́guez AM. Stereoselective ROP of rac-Lactide Mediated by Enantiopure NNO-Scorpionate Zinc Initiators. Organometallics 2014. [DOI: 10.1021/om500207x] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Manuel Honrado
- Departamento de
Quı́mica Inorgánica,
Orgánica y Bioquı́mica, Universidad de Castilla-La Mancha, Campus Universitario, 13071 Ciudad Real, Spain
| | - Antonio Otero
- Departamento de
Quı́mica Inorgánica,
Orgánica y Bioquı́mica, Universidad de Castilla-La Mancha, Campus Universitario, 13071 Ciudad Real, Spain
| | - Juan Fernández-Baeza
- Departamento de
Quı́mica Inorgánica,
Orgánica y Bioquı́mica, Universidad de Castilla-La Mancha, Campus Universitario, 13071 Ciudad Real, Spain
| | - Luis F. Sánchez-Barba
- Departamento de Quı́mica Inorgánica
y Analı́tica, Universidad Rey Juan Carlos, Móstoles, 28933 Madrid, Spain
| | - Andrés Garcés
- Departamento de Quı́mica Inorgánica
y Analı́tica, Universidad Rey Juan Carlos, Móstoles, 28933 Madrid, Spain
| | - Agustı́n Lara-Sánchez
- Departamento de
Quı́mica Inorgánica,
Orgánica y Bioquı́mica, Universidad de Castilla-La Mancha, Campus Universitario, 13071 Ciudad Real, Spain
| | - Ana M. Rodrı́guez
- Departamento de
Quı́mica Inorgánica,
Orgánica y Bioquı́mica, Universidad de Castilla-La Mancha, Campus Universitario, 13071 Ciudad Real, Spain
| |
Collapse
|
18
|
Liu J, Ma H. Aluminum complexes with bidentate amido ligands: synthesis, structure and performance on ligand-initiated ring-opening polymerization of rac-lactide. Dalton Trans 2014; 43:9098-110. [DOI: 10.1039/c4dt00353e] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
|
19
|
Honrado M, Otero A, Fernández-Baeza J, Sánchez-Barba LF, Garcés A, Lara-Sánchez A, Rodríguez AM. Enantiopure N,N,O-scorpionate zinc amide and chloride complexes as efficient initiators for the heteroselective ROP of cyclic esters. Dalton Trans 2014; 43:17090-100. [DOI: 10.1039/c4dt02178a] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Amide-containing zinc heteroscorpionates can act as single-component initiators for the well-controlled ROP of rac-LA to produce heterotactic-enriched materials.
Collapse
Affiliation(s)
- Manuel Honrado
- Departamento de Química Inorgánica
- Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Universidad de Castilla-La Mancha
- 13071-Ciudad Real, Spain
| | - Antonio Otero
- Departamento de Química Inorgánica
- Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Universidad de Castilla-La Mancha
- 13071-Ciudad Real, Spain
| | - Juan Fernández-Baeza
- Departamento de Química Inorgánica
- Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Universidad de Castilla-La Mancha
- 13071-Ciudad Real, Spain
| | | | - Andrés Garcés
- Departamento de Ciencias
- Universidad Rey Juan Carlos
- Móstoles-28933-Madrid, Spain
| | - Agustín Lara-Sánchez
- Departamento de Química Inorgánica
- Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Universidad de Castilla-La Mancha
- 13071-Ciudad Real, Spain
| | - Ana M. Rodríguez
- Departamento de Química Inorgánica
- Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Universidad de Castilla-La Mancha
- 13071-Ciudad Real, Spain
| |
Collapse
|
20
|
Garcés A, Sánchez-Barba LF, Fernández-Baeza J, Otero A, Honrado M, Lara-Sánchez A, Rodríguez AM. Heteroscorpionate Magnesium Alkyls Bearing Unprecedented Apical σ-C(sp3)–Mg Bonds: Heteroselective Ring-Opening Polymerization of rac-Lactide. Inorg Chem 2013; 52:12691-701. [DOI: 10.1021/ic401915b] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Andrés Garcés
- Departamento de Química Inorgánica
y Analítica, Universidad Rey Juan Carlos, Móstoles-28933-Madrid, Spain
| | - Luis F. Sánchez-Barba
- Departamento de Química Inorgánica
y Analítica, Universidad Rey Juan Carlos, Móstoles-28933-Madrid, Spain
| | - Juan Fernández-Baeza
- Departamento de Química Inorgánica, Orgánica
y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario, 13071-Ciudad Real, Spain
| | - Antonio Otero
- Departamento de Química Inorgánica, Orgánica
y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario, 13071-Ciudad Real, Spain
| | - Manuel Honrado
- Departamento de Química Inorgánica, Orgánica
y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario, 13071-Ciudad Real, Spain
| | - Agustín Lara-Sánchez
- Departamento de Química Inorgánica, Orgánica
y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario, 13071-Ciudad Real, Spain
| | - Ana M. Rodríguez
- Departamento de Química Inorgánica, Orgánica
y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario, 13071-Ciudad Real, Spain
| |
Collapse
|
21
|
Otero A, Fernández-Baeza J, Lara-Sánchez A, Sánchez-Barba LF. Metal complexes with heteroscorpionate ligands based on the bis(pyrazol-1-yl)methane moiety: Catalytic chemistry. Coord Chem Rev 2013. [DOI: 10.1016/j.ccr.2013.01.027] [Citation(s) in RCA: 143] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
22
|
Bleifuß SM, Hofmann FHF, Burzlaff N. An EnantiopureN,N,OHeteroscorpionate Ligand Derived from (-)-Menthone. Z Anorg Allg Chem 2013. [DOI: 10.1002/zaac.201300085] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
23
|
Edelmann FT. Recent Progress in the Chemistry of Metal Amidinates and Guanidinates. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2013. [DOI: 10.1016/b978-0-12-407692-1.00002-3] [Citation(s) in RCA: 104] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
|
24
|
Otero A, Fernández-Baeza J, Sánchez-Barba LF, Tejeda J, Honrado M, Garcés A, Lara-Sánchez A, Rodríguez AM. Chiral N,N,O-Scorpionate Zinc Alkyls as Effective and Stereoselective Initiators for the Living ROP of Lactides. Organometallics 2012. [DOI: 10.1021/om300146n] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Antonio Otero
- Departamento de Química
Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario,
13071-Ciudad Real, Spain
| | - Juan Fernández-Baeza
- Departamento de Química
Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario,
13071-Ciudad Real, Spain
| | - Luis F. Sánchez-Barba
- Departamento de Química
Inorgánica y Analítica, Universidad Rey Juan Carlos, Móstoles-28933-Madrid, Spain
| | - Juan Tejeda
- Departamento de Química
Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario,
13071-Ciudad Real, Spain
| | - Manuel Honrado
- Departamento de Química
Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario,
13071-Ciudad Real, Spain
| | - Andrés Garcés
- Departamento de Química
Inorgánica y Analítica, Universidad Rey Juan Carlos, Móstoles-28933-Madrid, Spain
| | - Agustín Lara-Sánchez
- Departamento de Química
Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario,
13071-Ciudad Real, Spain
| | - Ana M. Rodríguez
- Departamento de Química
Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario,
13071-Ciudad Real, Spain
| |
Collapse
|
25
|
Jones MW, Baldwin JE, Cowley AR, Dilworth JR, Karpov A, Smiljanic N, Thompson AL, Adlington RM. Synthesis of new bulky bis(pyrazolyl)methane carboxylate (heteroscorpionate) ligands and their complexes with iron, manganese and nickel. Dalton Trans 2012; 41:14068-86. [DOI: 10.1039/c2dt31859h] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
26
|
Ikpo N, Saunders LN, Walsh JL, Smith JMB, Dawe LN, Kerton FM. Zinc Complexes of Piperazinyl-Derived Aminephenolate Ligands: Synthesis, Characterization and Ring-Opening Polymerization Activity. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100703] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
27
|
Sánchez-Barba LF, Garcés A, Fernández-Baeza J, Otero A, Alonso-Moreno C, Lara-Sánchez A, Rodríguez AM. Stereoselective Production of Poly(rac-lactide) by ROP with Highly Efficient Bulky Heteroscorpionate Alkylmagnesium Initiators. Organometallics 2011. [DOI: 10.1021/om200163t] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Luis F. Sánchez-Barba
- Departamento de Química Inorgánica y Analítica, Universidad Rey Juan Carlos, Móstoles-28933-Madrid, Spain
| | - Andrés Garcés
- Departamento de Química Inorgánica y Analítica, Universidad Rey Juan Carlos, Móstoles-28933-Madrid, Spain
| | - Juan Fernández-Baeza
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario, 13071-Ciudad Real, Spain
| | - Antonio Otero
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario, 13071-Ciudad Real, Spain
| | - Carlos Alonso-Moreno
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario, 13071-Ciudad Real, Spain
| | - Agustín Lara-Sánchez
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario, 13071-Ciudad Real, Spain
| | - Ana M. Rodríguez
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario, 13071-Ciudad Real, Spain
| |
Collapse
|
28
|
Otero A, Lara-Sánchez A, Fernández-Baeza J, Alonso-Moreno C, Márquez-Segovia I, Sánchez-Barba LF, Castro-Osma JA, Rodríguez AM. Heteroscorpionate rare-earth initiators for the controlled ring-opening polymerization of cyclic esters. Dalton Trans 2011; 40:4687-96. [DOI: 10.1039/c0dt01678k] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
29
|
Schmidt S, Schulz S, Bläser D, Boese R, Bolte M. Synthesis and Structural Characterization of New Zinc Amidinate Complexes. Organometallics 2010. [DOI: 10.1021/om1008549] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Sarah Schmidt
- Institute of Inorganic Chemistry, University of Duisburg-Essen, 45117 Essen, Germany
| | - Stephan Schulz
- Institute of Inorganic Chemistry, University of Duisburg-Essen, 45117 Essen, Germany
| | - Dieter Bläser
- Institute of Inorganic Chemistry, University of Duisburg-Essen, 45117 Essen, Germany
| | - Roland Boese
- Institute of Inorganic Chemistry, University of Duisburg-Essen, 45117 Essen, Germany
| | - Michael Bolte
- Institute of Inorganic Chemistry, University of Frankfurt, 60438 Frankfurt, Germany
| |
Collapse
|
30
|
Zhang Z, Cui D, Trifonov AA. Synthesis and Characterization of Heteroscorpionate Rare-Earth Metal Dialkyl Complexes and Catalysis on MMA Polymerization. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.201000108] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
31
|
Garcés A, Sánchez-Barba LF, Alonso-Moreno C, Fajardo M, Fernández-Baeza J, Otero A, Lara-Sánchez A, López-Solera I, Rodríguez AM. Hybrid Scorpionate/Cyclopentadienyl Magnesium and Zinc Complexes: Synthesis, Coordination Chemistry, and Ring-Opening Polymerization Studies on Cyclic Esters. Inorg Chem 2010; 49:2859-71. [DOI: 10.1021/ic902399r] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Andrés Garcés
- Departamento de Química Inorgánica y Analítica, Universidad Rey Juan Carlos, Móstoles-28933-Madrid, Spain
| | - Luis F. Sánchez-Barba
- Departamento de Química Inorgánica y Analítica, Universidad Rey Juan Carlos, Móstoles-28933-Madrid, Spain
| | - Carlos Alonso-Moreno
- Departamento de Química Inorgánica y Analítica, Universidad Rey Juan Carlos, Móstoles-28933-Madrid, Spain
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario, 13071-Ciudad Real, Spain
| | - Mariano Fajardo
- Departamento de Química Inorgánica y Analítica, Universidad Rey Juan Carlos, Móstoles-28933-Madrid, Spain
| | - Juan Fernández-Baeza
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario, 13071-Ciudad Real, Spain
| | - Antonio Otero
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario, 13071-Ciudad Real, Spain
| | - Agustín Lara-Sánchez
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario, 13071-Ciudad Real, Spain
| | - Isabel López-Solera
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario, 13071-Ciudad Real, Spain
| | - Ana María Rodríguez
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario, 13071-Ciudad Real, Spain
| |
Collapse
|
32
|
Jones C, Furness L, Nembenna S, Rose RP, Aldridge S, Stasch A. Bulky guanidinato and amidinato zinc complexes and their comparative stabilities. Dalton Trans 2010; 39:8788-95. [DOI: 10.1039/c0dt00589d] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|