Regio‐controllable Cobalt‐Catalyzed Sequential Hydrosilylation/Hydroboration of Arylacetylenes

A cobalt-catalyzed regio-controllable sequential hydrosilylation/hydroboration of alkynes has been developed with complete control of all the possible regioselectivities for the double addition processes (up to >20/1 rr for all the cases). Various silylboronate regioisomers can be efficiently obtained from the same materials, with good functional group tolerance, regioselectivities as well as atom and pot economy.