Recent development in transition metal-catalysed C–H olefination

Transition metal-catalysed functionalizations of inert C–H bonds to construct C–C bonds represent an ideal route in the synthesis of valuable organic molecules. Fine tuning of directing groups, catalysts and ligands has played a crucial role in selective C–H bond (sp(2) or sp(3)) activation. Recent developments in these areas have assured a high level of regioselectivity in C–H olefination reactions. In this review, we have summarized the recent progress in the oxidative olefination of sp(2) and sp(3) C–H bonds with special emphasis on distal, atroposelective, non-directed sp(2) and directed sp(3) C–H olefination. The scope, limitation, and mechanism of various transition metal-catalysed olefination reactions have been described briefly.