3d/4f Coordination Clusters as Cooperative Catalysts for Highly Diastereoselective Michael Addition Reactions

Griffiths, Kieran and Tsipis, Athanassios C. and Kumar, Prashant and Townrow, Oliver P. E. and Abdul-Sada, Alaa and Akien, Geoffrey R. and Baldansuren, Amgalanbaatar and Spivey, Alan C. and Kostakis, George E. (2017) 3d/4f Coordination Clusters as Cooperative Catalysts for Highly Diastereoselective Michael Addition Reactions. Inorganic Chemistry, 56 (16). pp. 9563-9573. ISSN 0020-1669

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Michael addition (MA) is one of the most well studied chemical transformation in synthetic chemistry. Here, we report the synthesis and crystal structures of a library of 3d/4f coordination clusters (CCs) formulated as [Zn(II)2Y(III)2L4(solv)X(Z)Y] and study their catalytic properties toward the MA of nitrostyrenes with barbituric acid derivatives. Each CC presents two borderline hard/soft Lewis acidic Zn(II) centers and two hard Lewis acidic Y(III) centers in a defect dicubane topology that brings the two different metals into a proximity of ∼3.3 Å. Density functional theory computational studies suggest that these tetrametallic CCs dissociate in solution to give two catalytically active dimers, each containing one 3d and one 4f metal that act cooperatively. The mechanism of catalysis has been corroborated via NMR, electron paramagnetic resonance, and UV-vis. The present work demonstrates for the first time the successful use of 3d/4f CCs as efficient and high diastereoselective catalysts in MA reactions.

Item Type:
Journal Article
Journal or Publication Title:
Inorganic Chemistry
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Post Print: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Inorganic Chemistry, copyright ©2017 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/acs.inorgchem.7b01011
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?? physical and theoretical chemistryinorganic chemistry ??
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Deposited On:
22 Aug 2017 13:12
Last Modified:
22 Mar 2024 00:43