1
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Das S, Goswami G, Halder S, Ghorai MK. Domino imino-aldol-aza-Michael and imino-aldol-aza-Michael-imino-aldol reactions: Diastereoselective synthesis of highly functionalized 2,6-disubstituted piperidines. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132285] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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2
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Elsen H, Fischer C, Knüpfer C, Escalona A, Harder S. Early Main Group Metal Catalysts for Imine Hydrosilylation. Chemistry 2019; 25:16141-16147. [PMID: 31617621 PMCID: PMC6973166 DOI: 10.1002/chem.201904148] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Indexed: 01/24/2023]
Abstract
The efficient catalytic reduction of imines with phenylsilane is achieved by using the potassium, calcium and strontium based catalysts [(DMAT)K (THF)]∞ , (DMAT)2 Ca⋅(THF)2 and (DMAT)2 Sr⋅(THF)2 (DMAT=2-dimethylamino-α-trimethylsilylbenzyl). Eight different aldimines and the ketimine Ph2 C=NPh could be successfully reduced by PhSiH3 at temperatures between 25-60 °C with catalyst loadings down to 2.5 mol %. Also, simple amides like KN(SiMe3 )2 or Ae[N(SiMe3 )2 ]2 (Ae=Ca, Sr, Ba) catalyze this reaction. Activities increase with metal size. For most substrates the activity increases along the row K<Ca<Sr<Ba. Fastest conversion was found for imines with alkyl substituents at N and aryl rings at C, for example, PhC(H)=NtBu, while tBuC(H)=NtBu or PhC(H)=NPh react much slower. Reasonable functional group tolerance is observed. The proposed metal hydride mechanism is supported by stoichiometric reactions using a catalyst model system, isolation of intermediates and DFT calculations.
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Affiliation(s)
- Holger Elsen
- Inorganic and Organometallic ChemistryFriedrich-Alexander-Universität Erlangen-NürnbergEgerlandstraße 191058ErlangenGermany
| | - Christian Fischer
- Inorganic and Organometallic ChemistryFriedrich-Alexander-Universität Erlangen-NürnbergEgerlandstraße 191058ErlangenGermany
| | - Christian Knüpfer
- Inorganic and Organometallic ChemistryFriedrich-Alexander-Universität Erlangen-NürnbergEgerlandstraße 191058ErlangenGermany
| | - Ana Escalona
- Inorganic and Organometallic ChemistryFriedrich-Alexander-Universität Erlangen-NürnbergEgerlandstraße 191058ErlangenGermany
| | - Sjoerd Harder
- Inorganic and Organometallic ChemistryFriedrich-Alexander-Universität Erlangen-NürnbergEgerlandstraße 191058ErlangenGermany
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3
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Rajasekar S, Anbarasan P. One-Pot Transannulation of N-Sulfonyl-1,2,3-triazoles to Dihydro-β-carbolines and Dihydroisoquinolines via Rhodium-Catalyzed C–H Insertion-cum-Base-Mediated Aza-Michael Reaction. J Org Chem 2019; 84:7747-7761. [DOI: 10.1021/acs.joc.9b00644] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Shanmugam Rajasekar
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - Pazhamalai Anbarasan
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
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4
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Azizpoor Fard M, Behnia A, Puddephatt RJ. Models for Cooperative Catalysis: Oxidative Addition Reactions of Dimethylplatinum(II) Complexes with Ligands Having Both NH and OH Functionality. ACS OMEGA 2019; 4:257-268. [PMID: 31459328 PMCID: PMC6648696 DOI: 10.1021/acsomega.8b03089] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 12/24/2018] [Indexed: 06/10/2023]
Abstract
The role of NH and OH groups in the oxidative addition reactions of the complexes [PtMe2(κ2-N,N'-L)], L = 2-C5H4NCH2NH-x-C6H4OH [3, x = 2, L = L1; 4, x = 3, L = L2; 5, x = 4, L = L3], has been investigated. Complex 3 is the most reactive. It reacts with CH2Cl2 to give a mixture of isomers of [PtMe2(CH2Cl)(κ3-N,N',O-(L1-H)], 6, and decomposes in acetone to give [PtMe3(κ3-N,N',O-(L1-H)], 7, both of which contain the fac tridentate deprotonated ligand. Complex 3 reacts with MeI to give complex 7, whereas 4 and 5 react to give [PtIMe3(κ2-N,N'-L2))], 8, or [PtIMe3(κ2-N,N'-L3)], 9, respectively. Each complex 3, 4, or 5 reacts with either dioxygen or hydrogen peroxide to give the corresponding complex [Pt(OH)2Me2(κ2-N,N'-L)], 10, L = L1; 11, L = L2; 12, L = L3. The ligand L3 in complexes 9 and 12 is easily oxidized to the corresponding imine ligand 2-C5H4NCH=N-4-C6H4OH, L4, in forming the complexes [PtIMe3(κ2-N,N'-L4)], 13, and [Pt(OH)2Me2(κ2-N,N'-L4)], 14, respectively. The NH and OH groups play a significant role in supramolecular polymer or sheet structures of the complexes, formed through intermolecular hydrogen bonding, and these structures indicate how either intramolecular or intermolecular hydrogen bonding may assist some oxidative addition reactions.
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5
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Espinoza-Hicks C, Montoya P, Bautista R, Jiménez-Vázquez HA, Rodríguez-Valdez LM, Camacho-Dávila AA, Cossío FP, Delgado F, Tamariz J. Synthesis of exo-Imidazolidin-2-one Dienes, Their Isomerization, and Selectivity in Diels-Alder Cycloadditions. J Org Chem 2018; 83:5347-5364. [PMID: 29697257 DOI: 10.1021/acs.joc.7b02344] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
An efficient and alternative synthesis of exo-imidazolidin-2-one dienes is described. A condensation reaction was carried out with bis-imino derivatives, diacetyl, and triphosgene, affording symmetrically N, N-disubstituted dienes. The use of alkyl methyl α-diketones led to the formation of nonsymmetrical dienes, which underwent isomerization to provide more stable inner-outer-ring dienes under Lewis acid conditions. Evaluation was made of the reactivity as well as regio- and stereoselectivity of these dienes in Diels-Alder reactions. They proved to be highly reactive and selective. DFT calculations of the transition states accounted for their behavior.
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Affiliation(s)
- Carlos Espinoza-Hicks
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas , Instituto Politécnico Nacional , Prol. Carpio y Plan de Ayala, S/N , Mexico City 11340 , Mexico.,Departamento de Química Orgánica, Facultad de Ciencias Químicas , Universidad Autónoma de Chihuahua , Circuito Universitario S/N , Chihuahua , Chih. 31125 , Mexico
| | - Pablo Montoya
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas , Instituto Politécnico Nacional , Prol. Carpio y Plan de Ayala, S/N , Mexico City 11340 , Mexico
| | - Rafael Bautista
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas , Instituto Politécnico Nacional , Prol. Carpio y Plan de Ayala, S/N , Mexico City 11340 , Mexico
| | - Hugo A Jiménez-Vázquez
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas , Instituto Politécnico Nacional , Prol. Carpio y Plan de Ayala, S/N , Mexico City 11340 , Mexico
| | - Luz M Rodríguez-Valdez
- Departamento de Química Orgánica, Facultad de Ciencias Químicas , Universidad Autónoma de Chihuahua , Circuito Universitario S/N , Chihuahua , Chih. 31125 , Mexico
| | - Alejandro A Camacho-Dávila
- Departamento de Química Orgánica, Facultad de Ciencias Químicas , Universidad Autónoma de Chihuahua , Circuito Universitario S/N , Chihuahua , Chih. 31125 , Mexico
| | - Fernando P Cossío
- Departamento de Química Orgánica I and ORFEO-CINQA , Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International Physics Center (DIPC) , PO Box 1072, San Sebastián/Donostia 20018 , Spain
| | - Francisco Delgado
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas , Instituto Politécnico Nacional , Prol. Carpio y Plan de Ayala, S/N , Mexico City 11340 , Mexico
| | - Joaquín Tamariz
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas , Instituto Politécnico Nacional , Prol. Carpio y Plan de Ayala, S/N , Mexico City 11340 , Mexico
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6
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Hirata G, Satomura H, Kumagae H, Shimizu A, Onodera G, Kimura M. Direct Allylic Amination of Allylic Alcohol Catalyzed by Palladium Complex Bearing Phosphine–Borane Ligand. Org Lett 2017; 19:6148-6151. [DOI: 10.1021/acs.orglett.7b03023] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Goki Hirata
- Division of Chemistry and Materials
Science, Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Hideaki Satomura
- Division of Chemistry and Materials
Science, Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Hidenobu Kumagae
- Division of Chemistry and Materials
Science, Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Aika Shimizu
- Division of Chemistry and Materials
Science, Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Gen Onodera
- Division of Chemistry and Materials
Science, Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Masanari Kimura
- Division of Chemistry and Materials
Science, Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
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7
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Naresh A, Marumudi K, Kunwar AC, Rao BV. Palladium-Catalyzed Double Allylation of Sugar-Imines by Employing Tamaru-Kimura's Protocol: Access to Unnatural Iminosugars. Org Lett 2017; 19:1642-1645. [PMID: 28290702 DOI: 10.1021/acs.orglett.7b00441] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Conversion of vinyl pyranosylamine and vinyl furanosylamines to 2,6- and 2,5-disubstituted pyrrolidine and piperidine iminosugars, respectively, in one pot was developed using Kimura and Tamaru's procedure, where a Pd salt in the presence of Et2Zn was used for the domino reaction. In this procedure, double allylation, which involves nucleophilic allylation-heterocyclization, took place to give desired nitrogen heterocycles. This strategy was further elaborated to synthesize some unnatural deoxycalystegines, hydroxylated pyrrolidines, piperidines, and indolizidine analogues.
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Affiliation(s)
- Annavareddi Naresh
- Organic and Biomolecular Chemistry Division and ‡Centre for NMR & Structural Chemistry, CSIR-Indian Institute of Chemical Technology , Tarnaka, Hyderabad 500007, India
| | - Kanakaraju Marumudi
- Organic and Biomolecular Chemistry Division and ‡Centre for NMR & Structural Chemistry, CSIR-Indian Institute of Chemical Technology , Tarnaka, Hyderabad 500007, India
| | - A C Kunwar
- Organic and Biomolecular Chemistry Division and ‡Centre for NMR & Structural Chemistry, CSIR-Indian Institute of Chemical Technology , Tarnaka, Hyderabad 500007, India
| | - Batchu Venkateswara Rao
- Organic and Biomolecular Chemistry Division and ‡Centre for NMR & Structural Chemistry, CSIR-Indian Institute of Chemical Technology , Tarnaka, Hyderabad 500007, India
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8
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The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2015. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2016.08.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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9
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Gutiérrez S, Coppola A, Sucunza D, Burgos C, Vaquero JJ. Synthesis of 1-Substituted Isoquinolines by Heterocyclization of TosMIC Derivatives: Total Synthesis of Cassiarin A. Org Lett 2016; 18:3378-81. [DOI: 10.1021/acs.orglett.6b01521] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Sara Gutiérrez
- Departamento de Química
Orgánica y Química Inorgánica, Universidad de Alcalá, Alcalá de Henares 28871, Spain
| | - Anna Coppola
- Departamento de Química
Orgánica y Química Inorgánica, Universidad de Alcalá, Alcalá de Henares 28871, Spain
| | - David Sucunza
- Departamento de Química
Orgánica y Química Inorgánica, Universidad de Alcalá, Alcalá de Henares 28871, Spain
| | - Carolina Burgos
- Departamento de Química
Orgánica y Química Inorgánica, Universidad de Alcalá, Alcalá de Henares 28871, Spain
| | - Juan J. Vaquero
- Departamento de Química
Orgánica y Química Inorgánica, Universidad de Alcalá, Alcalá de Henares 28871, Spain
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10
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He J, Shi Y, Cheng W, Man Z, Yang D, Li CY. Rhodium-Catalyzed Synthesis of 4-Bromo-1,2-dihydroisoquinolines: Access to Bromonium Ylides by the Intramolecular Reaction of a Benzyl Bromide and an α-Imino Carbene. Angew Chem Int Ed Engl 2016; 55:4557-61. [PMID: 26933933 DOI: 10.1002/anie.201512015] [Citation(s) in RCA: 87] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Revised: 01/30/2016] [Indexed: 01/31/2023]
Affiliation(s)
- Jun He
- Department of Chemistry; Zhejiang Sci-Tech University; Xiasha West Higher Education District Hangzhou 310018 China
| | - Yinping Shi
- Department of Chemistry; Zhejiang Sci-Tech University; Xiasha West Higher Education District Hangzhou 310018 China
| | - Wanli Cheng
- Department of Chemistry; Zhejiang Sci-Tech University; Xiasha West Higher Education District Hangzhou 310018 China
| | - Zengming Man
- Department of Chemistry; Zhejiang Sci-Tech University; Xiasha West Higher Education District Hangzhou 310018 China
| | - Dongdong Yang
- Department of Chemistry; Zhejiang Sci-Tech University; Xiasha West Higher Education District Hangzhou 310018 China
| | - Chuan-Ying Li
- Department of Chemistry; Zhejiang Sci-Tech University; Xiasha West Higher Education District Hangzhou 310018 China
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11
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He J, Shi Y, Cheng W, Man Z, Yang D, Li CY. Rhodium-Catalyzed Synthesis of 4-Bromo-1,2-dihydroisoquinolines: Access to Bromonium Ylides by the Intramolecular Reaction of a Benzyl Bromide and an α-Imino Carbene. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201512015] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Jun He
- Department of Chemistry; Zhejiang Sci-Tech University; Xiasha West Higher Education District Hangzhou 310018 China
| | - Yinping Shi
- Department of Chemistry; Zhejiang Sci-Tech University; Xiasha West Higher Education District Hangzhou 310018 China
| | - Wanli Cheng
- Department of Chemistry; Zhejiang Sci-Tech University; Xiasha West Higher Education District Hangzhou 310018 China
| | - Zengming Man
- Department of Chemistry; Zhejiang Sci-Tech University; Xiasha West Higher Education District Hangzhou 310018 China
| | - Dongdong Yang
- Department of Chemistry; Zhejiang Sci-Tech University; Xiasha West Higher Education District Hangzhou 310018 China
| | - Chuan-Ying Li
- Department of Chemistry; Zhejiang Sci-Tech University; Xiasha West Higher Education District Hangzhou 310018 China
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12
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Chaudhari TY, Urvashi U, Ginotra SK, Yadav P, Kumar G, Tandon V. Regioselective synthesis of functionalized dihydroisoquinolines from o-alkynylarylaldimines via the Reformatsky reaction. Org Biomol Chem 2016; 14:9896-9906. [DOI: 10.1039/c6ob01790h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel approach for the synthesis of functionalized 1,2-dihydroisoquinolines from o-alkynylarylaldimines via the Reformatsky reaction without the aid of an external Lewis acid has been described.
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Affiliation(s)
| | - Urvashi Urvashi
- Department of Chemistry
- University of Delhi
- New Delhi-110007
- India
| | | | - Pooja Yadav
- Department of Chemistry
- University of Delhi
- New Delhi-110007
- India
| | - Gulshan Kumar
- Department of Chemistry
- University of Delhi
- New Delhi-110007
- India
| | - Vibha Tandon
- Special Centre for Molecular Medicine
- Jawahar Lal Nehru University
- New Delhi-110067
- India
- Department of Chemistry
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13
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Yamada N, Hirata G, Onodera G, Kimura M. Efficient synthesis of pyrrolizidine by Pd-catalyzed consecutive double amphiphilic allylation of nitrile. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.04.110] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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14
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Wender PA, Jeffreys MS, Raub AG. Tetramethyleneethane Equivalents: Recursive Reagents for Serialized Cycloadditions. J Am Chem Soc 2015; 137:9088-93. [PMID: 25961416 PMCID: PMC4772776 DOI: 10.1021/jacs.5b04091] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
![]()
New reactions and reagents that allow
for multiple bond-forming
events per synthetic operation are required to achieve structural
complexity and thus value with step-, time-, cost-, and waste-economy.
Here we report a new class of reagents that function like tetramethyleneethane
(TME), allowing for back-to-back [4 + 2] cycloadditions, thereby amplifying
the complexity-increasing benefits of Diels–Alder and metal-catalyzed
cycloadditions. The parent recursive reagent, 2,3-dimethylene-4-trimethylsilylbutan-1-ol
(DMTB), is readily available from the metathesis of ethylene and THP-protected
4-trimethylsilylbutyn-1-ol. DMTB and related reagents engage diverse
dienophiles in an initial Diels–Alder or metal-catalyzed [4
+ 2] cycloaddition, triggering a subsequent vinylogous Peterson elimination
that recursively generates a new diene for a second cycloaddition.
Overall, this multicomponent catalytic cascade produces in one operation
carbo- and heterobicyclic building blocks for the synthesis of a variety
of natural products, therapeutic leads, imaging agents, and materials.
Its application to the three step synthesis of a new solvatochromic
fluorophore, N-ethyl(6-N,N-dimethylaminoanthracene-2,3-dicarboximide) (6-DMA), and
the photophysical characterization of this fluorophore are described.
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Affiliation(s)
- Paul A Wender
- Department of Chemistry, Department of Chemical and Systems Biology, Stanford University, Stanford, California 94305-5080, United States
| | - Matthew S Jeffreys
- Department of Chemistry, Department of Chemical and Systems Biology, Stanford University, Stanford, California 94305-5080, United States
| | - Andrew G Raub
- Department of Chemistry, Department of Chemical and Systems Biology, Stanford University, Stanford, California 94305-5080, United States
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