Selective Hydrosilylation of 1,3-Diynes Catalyzed by Titania-Supported Platinum

FRANCISCO ALONSO; ROBISON BUITRAGO; YANINA MOGLIE; ANTONIO SEPÚLVEDA-ESCRIBANO; MIGUEL YUS

ORGANOMETALLICS

AMER CHEMICAL SOC

Lugar: Washington; Año: 2012 vol. 31 p. 2336 - 2342

0276-7333

Titania-supported platinum (mainly as Pt(II)) has been found to effectively catalyze the hydrosilylation of 1,3- diynes at 70 °C with low catalyst loading (0.25 mol %) under solvent-free conditions. Monohydrosilylation was achieved for diaryl-substituted diynes, whereas dialkyl-substituted diynes were transformed into the corresponding dihydrosilylated products in good yields. In every case, the process was proven to be highly stereoselective, with syn addition of the silicon−hydrogen bond, and regioselective, with the silicon moiety exclusively bonded to the most internal carbon atom of the 1,3-diyne (a-E product), as confirmed by X-ray crystallography