Regio- and Stereoselective Cobalt-Catalyzed Hydrosilylation of 1,3-Diynes with Primary and Secondary Silanes

Reported herein is a well-defined geometry-contrained tridentate NNN-cobalt complex for a regio- and stereoselective hydrosilylaiton of 1,3-diynes. Both primary and secondary silanes were suitable silylating reagents in this catalytic protocol. A wide range of symmetrical and unsymmetrical 1,3-diynes were tolerated to give a diversity of 1,3-enynylsilanes in moderate to excellent yields. The scale-up reaction demonstrated the practicality and efficiency of the developed strategy, as well as other further derivations of 1,3-enynylsilanes