Carbon dioxide (CO2) is an ideal C1 source. Therefore, the efficient conversion of CO2 with the aid of transition-metal catalysts is highly appropriate.1 Herein we report the Cu-catalyzed hydrocarboxylation of alkynes2 and the Ni-catalyzed carboxylation of aryl and vinyl chlorides3 employing carbon dioxide. In the former case, the use of mild and easy-to-handle hydrosilane as a reducing agent realizes highly efficient hydrocarboxylation of alkynes. In the latter case, the reactions proceeded under a CO2 pressure of 1 atm at room temperature in the presence of Ni-catalysts and Mn powder as a reducing agent. Various aryl chlorides are converted to the corresponding carboxylic acid in good to high yields.1.    For a Review, see: Y. Tsuji et al. Chem. Commun., 2012 , 48, 9956�9964.2.    Y. Tsuji et al. Angew. Chem., Int. Ed. 2011 , 50, 523�527.3.   Y. Tsuji et al. J. Am. Chem. Soc. 2012 , 134, 9106-9109.

Carbon dioxide as a carbon source in transition-metal catalyzed carbon–carbon bond formation

245th National Meeting (2013)

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