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Chem Rev. 2016 Aug 10;116(15):8873-911. doi: 10.1021/acs.chemrev.6b00034. Epub 2016 May 10.

Main Group Lewis Acid-Mediated Transformations of Transition-Metal Hydride Complexes.

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1
Department of Chemistry, University of Houston , Lamar Fleming Jr. Building, 3585 Cullen Boulevard, Room 112, Houston, Texas 77204-5003, United States.

Abstract

This Review highlights stoichiometric reactions and elementary steps of catalytic reactions involving cooperative participation of transition-metal hydrides and main group Lewis acids. Included are reactions where the transition-metal hydride acts as a reactant as well as transformations that form the metal hydride as a product. This Review is divided by reaction type, illustrating the diverse roles that Lewis acids can play in mediating transformations involving transition-metal hydrides as either reactants or products. We begin with a discussion of reactions where metal hydrides form direct adducts with Lewis acids, elaborating the structure and dynamics of the products of these reactions. The bulk of this Review focuses on reactions where the transition metal and Lewis acid act in cooperation, and includes sections on carbonyl reduction, H2 activation, and hydride elimination reactions, all of which can be promoted by Lewis acids. Also included is a section on Lewis acid-base secondary coordination sphere interactions, which can influence the reactivity of hydrides. Work from the past 50 years is included, but the majority of this Review focuses on research from the past decade, with the intent of showcasing the rapid emergence of this field and the potential for further development into the future.

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