New Anionic Rhodium Complexes As Catalysts for the Reduction of Acetophenone and Its Derivatives

Overview

Journal RSC Adv

Publisher Royal Society of Chemistry

Specialty Chemistry

Date 2022 May 6

PMID 35517621

Authors

Olga Bartlewicz

Magdalena Jankowska-Wajda

Hieronim Maciejewski

Affiliations

Soon will be listed here.

Abstract

New anionic rhodium(iii) complexes, obtained by a simple reaction of RhCl with organic chlorides (derivatives of imidazole and pyridine), have been employed as catalysts for hydrosilylation (reduction) of acetophenone derivatives. The reactions, in which 1,1,1,3,5,5,5-heptamethyltrisiloxane was a reducing agent, proceeded in a biphasic system because the above complexes are insoluble in the reaction medium. Thereby easy isolation of the complexes from post-reaction mixtures was possible after reaction completion. This is the first example of the application of rhodium complexes of this type as catalysts for ketone reduction. The complexes have shown high activity and enabled obtaining the hydrosilylation product in a very short time and in the range of low concentrations (0.1 mol%). By using FT-IR analysis that enables measuring product concentrations in real time, a comparison has been made of the catalytic activity for hydrosilylation of acetophenone and methoxyacetophenone isomers shown by four rhodium complexes ([C][RhCl ]) differing in cations and the most effective catalyst for this process has been distinguished.

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