Rhodium-catalyzed and Coordination-assisted Regioselective Alkenylation of Aromatic C-H Bonds with Terminal Silylacetylenes

A number of aryl-N-heterocycles and aromatic imines efficiently undergo ortho alkenylation via C-H bond cleavage upon treatment with bulky terminal silylacetylenes, typically triisopropylsilylacetylene, in the presence of [RhCl(cod)](2)/PAr3 as catalyst.