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Duvinage D, Janssen M, Lork E, Grützmacher H, Mebs S, Beckmann J. Kinetic Stabilization of Heavier Bis(m‐terphenyl)pnictogen Phosphaethynolates. Z Anorg Allg Chem 2022. [DOI: 10.1002/zaac.202200133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
| | | | | | | | | | - Jens Beckmann
- Universität Bremen Institut fuer Biologie und Chemie Leobener Str. 28359 Bremen GERMANY
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Pop A, Silvestru C, Silvestru A. Organoselenium and organotellurium compounds containing chalcogen-oxygen bonds in organic synthesis or related processes. PHYSICAL SCIENCES REVIEWS 2019. [DOI: 10.1515/psr-2018-0061] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Abstract
This chapter emphasizes aspects related to the role of organochalcogen (Se, Te) compounds with single E‒O and/or double E=O (E=Se, Te) bonds in organic synthesis, as reagents, intermediates, or catalysts, and it gives a larger extent mainly to data reported in the field during the last ten years. For each of these two heavier chalcogens the material is structured according to the oxidation state of the chalcogen and, for the same oxidation state, in sections dedicated to a particular type of compounds. Functionalization or cyclization reactions in which the organochalcogen compounds take part as nucleophiles, electrophiles or radicals, employed in various synthetic transformations, are discussed and, where available, the mechanistic aspects are outlined. New chiral species and new strategies were developed during last years in order to increase the yield, the reaction rate and the stereoselectivity in specific organic transformations, i.e. addition, oxidation, elimination, cyclization or rearrangement reactions. A notably attention was devoted to easily accessible and environmental friendly catalysts, re-usable and “green” solvents, as well as waste-free procedures.
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Grabowsky S, Mallow O, Pal R, Pergandé Y, Lork E, Näther C, Beckmann J. Conformational trimorphism of bis(2,6-dimesitylphenyl)ditelluride. Z KRIST-CRYST MATER 2018. [DOI: 10.1515/zkri-2018-2077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Besides the previously known α-form (monoclinic, P21/c, Z=4) of bis(2,6-dimesitylphenyl)ditelluride, two new polymorphic modifications, namely the β-form (monoclinic, P21/c, Z=8) and the γ-form (triclinic, P1̅, Z=2), were obtained serendipitously during chemical reactions. In all three modifications, the individual molecules possess significantly different conformations and bond parameters, such as Te–Te bond lengths, C–Te–Te bond angles, C–Te–Te–C torsion angles and intramolecular Menshutkin interactions, which is also reflected in their non-covalent interactions with adjacent molecules in the crystal lattice via London dispersion and electrostatic forces. The interplay between intermolecular and intramolecular forces in these conformational polymorphs was investigated using quantum chemical calculations, which reveal that the β-form should be thermodynamically stable at absolute zero. In contrast, crystallization experiments and thermoanalytical investigations indicate that the α-form is stable at high temperatures and therefore, both forms might be related by enantiotropism.
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Affiliation(s)
- Simon Grabowsky
- Institut für Anorganische Chemie und Kristallographie, Universität Bremen , Leobener Straße 3 und 7 , 28359 Bremen , Germany
| | - Ole Mallow
- Institut für Anorganische Chemie und Kristallographie, Universität Bremen , Leobener Straße 3 und 7 , 28359 Bremen , Germany
| | - Rumpa Pal
- Institut für Anorganische Chemie und Kristallographie, Universität Bremen , Leobener Straße 3 und 7 , 28359 Bremen , Germany
| | - Yves Pergandé
- Institut für Anorganische Chemie und Kristallographie, Universität Bremen , Leobener Straße 3 und 7 , 28359 Bremen , Germany
| | - Enno Lork
- Institut für Anorganische Chemie und Kristallographie, Universität Bremen , Leobener Straße 3 und 7 , 28359 Bremen , Germany
| | - Christian Näther
- Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel , Max-Eyth-Str. 2 , 24118 Kiel , Germany
| | - Jens Beckmann
- Institut für Anorganische Chemie und Kristallographie, Universität Bremen , Leobener Straße 3 und 7 , 28359 Bremen , Germany
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Srivastava K, Panda A, Sharma S, Singh HB. Telluroxanes: Synthesis, structure and applications. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2018.02.036] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Hejda M, Lork E, Mebs S, Dostál L, Beckmann J. Intramolecularly Coordinated 2‐Iminomethylphenyltellurium Compounds. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700421] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Martin Hejda
- Institut für Anorganische Chemie und Kristallographie Universität Bremen Leobener Straße 7 28359 Bremen Germany
- Department of General and Inorganic Chemistry University of Pardubice Studentská 573 53210 Pardubice Czech Republic
| | - Enno Lork
- Institut für Anorganische Chemie und Kristallographie Universität Bremen Leobener Straße 7 28359 Bremen Germany
| | - Stefan Mebs
- Institut für Chemie und Biochemie Freie Universität Berlin Arnimallee 14 14195 Berlin Germany
| | - Libor Dostál
- Department of General and Inorganic Chemistry University of Pardubice Studentská 573 53210 Pardubice Czech Republic
| | - Jens Beckmann
- Institut für Anorganische Chemie und Kristallographie Universität Bremen Leobener Straße 7 28359 Bremen Germany
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