Stereo- and regioselective Pt(DVDS)/P(iBuNCH2CH2)3N-catalyzed hydrosilylation of terminal alkynes

The catalyst system Pt(DVDS)/P((BuNCH2CH2)-Bu-i)(3)N (DVDS = [(H2C=CH)Me2Si](2)O), containing a bulky aminophosphine ligand, catalyzes the hydrosilylation of terminal alkynes possessing a variety of functional groups using Ph3SiH or Et3SiH. These reactions occur stereo- and regioselectively to give beta-(E)-vinylsilanes with 97-99% selectivity in 76-98% yield. Using Pt-2(DVDS)(3), this selectivity ranged from 63 to 93%, except in one case, where the selectivities were the same for both catalyst systems.