Facile double-bond migration of allylsilanes in the coordination sphere of tungsten complexes

Novel tungsten(0) complexes containing η2-allylsilane ligands (CH2CH–CH2–SiR3, R = Me, OMe, Cl) have been generated during photolysis of W(CO)6 and allylsilanes in alkane solution, and their molecular structure has been elucidated by IR and NMR spectroscopic methods. The catalytic activity of the [W(CO)5(η2-allylsilane)] complexes in double-bond isomerization of allylsilane leading to Z- and E-1-propenylsilane has been revealed and the mechanism of this reaction is discussed.

Tungsten(0)-η2-allylsilane complexes [W(CO)5(η2-CH2CH–CH2–SiR3)] and trans-[W(CO)4(η2-CH2CH–CH2–SiR3)2] (R3 = Me3, (OMe)3, ClMe2, Cl3) have been generated during photolysis of W(CO)6 and allylsilane, and their molecular structure has been elucidated by IR and NMR spectroscopic methods. Facile double-bond migration of allylsilanes in the coordination sphere of [W(CO)5(η2-allylsilane)] complexes has been revealed. Figure optionsDownload as PowerPoint slide