Soluble Organocalcium Compounds for the Activation and Conversion of Carbon Dioxide and Heteroaromatic Substrates

摘要

The effective activation of (hetero)aromatic compounds is of particular interest for the production of tailor made compounds that can serve as key intermediates in the development of alternative combustion fuels. As a sustainable alternative for late transition metals, organocalcium complexes are studied in the context of activation of carbon dioxide and aromatic N- and O-heterocycles. Highly regioselective C-H bond activation and carbometalation reactions have been observed for conversions with pyridine derivatives. Rapid insertion of CO_2 into calcium carbon bonds of the obtained products is observed. Furan derivatives are found more inert and the formation of polymeric products is described. Slow isomerization of 2,5-dihydrofuran (2,5-DHF) to 2,3-dihydrofuran (2,3-DHF) is reported.