Syntheses of Novel Transition Metal-Carbene Complexes Effective for C-H Bond Activation of Alkanes and Development of New Synthetic Reactions

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New rhodium complexes that are ligated by N-heteroaromatic carbenes were synthesized, and, under photo irradiation condition, their catalytic activities toward carbon-hydrogen bond activations of arenes and alkanes were investigated. However, the rhodium complexes were less reactive for the reactions. When the carbonylation reaction was carried out in the presence of carbonyl compounds, the acceleration effect was observed. During the course of the research directed toward the syntheses of more active transition metal complexes, palladium-catalyzed dehydrogenative coupling reaction of terminal alkynes with alkenes, and rhodium-catalyzed enantioselective synthesis of cyclopentanols from cyclobutanols were achieved.