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Cobalt-Catalyzed Regio- and Stereoselective Hydroboration of Allenes.

An efficient pincer ligand-based cobalt complex-catalyzed allene hydroboration affording Z -allylic boronates is described. The reaction enjoys an excellent regio- as well as Z- stereoselectivity and a wide substrate scope tolerating many functional groups. Based on SAESI/MS studies, a rationale for the cobalt-catalyzed hydroboration involving the highly selective insertion of allene into the Co-H bond to form Z -allylic cobalt intermediates is proposed.