Regio- and Stereoselective Copper(II)-Catalyzed Hydrosilylation of Activated Allenes in Water: Access to Vinylsilanes

By using catalytic amounts of copper­(II), 4-picoline, and dimethyl­phenylsilyl­pinacol borane, a series of allenoates were silylated on the β carbon in good to excellent yields and high (<i>E</i>)-selectivity. The mild and efficient silylation method is conducted in water under atmospheric conditions to afford vinylsilanes