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Cobalt- and Rhodium-catalyzed Carboxylation Using Carbon Dioxide As the C1 Source

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Specialty Chemistry
Date 2018 Oct 23
PMID 30344768
Citations 2
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Abstract

Carbon dioxide (CO) is one of the most important materials as renewable chemical feedstock. In this review, the Co- and Rh-catalyzed transformation of CO via carbon-carbon bond-forming reactions is summarized. Combinations of metals (cobalt or rhodium), substrates, and reducing agents realize efficient carboxylation reactions using CO. The carboxylation of propargyl acetates and alkenyl triflates using cobalt complexes as well as the cobalt-catalyzed reductive carboxylation of α,β-unsaturated nitriles and carboxyamides in the presence of EtZn proceed. A Co complex has been demonstrated to act as an efficient catalyst in the carboxylation of allylic C(sp)-H bonds. Employing zinc as the reductant, carboxyzincation and the four-component coupling reaction between alkyne, acrylates, CO, and zinc occur efficiently. Rh complexes also catalyze the carboxylation of arylboronic esters, C(sp)-H carboxylation of aromatic compounds, and hydrocarboxylation of styrene derivatives. The Rh-catalyzed [2 + 2 + 2] cycloaddition of diynes and CO proceeds to afford pyrones.

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