WITTIG SYNTHESIS OF ALLYLIC ORGANOSILICON COMPOUNDS

The reactions of β-silylalkylidenetriphenylphosphoranes (prepared by the action of alkylidenetriphenylphosphoranes on iodomethylsilicon compounds, followed by deprotonation of the resulting β-silylalkyltriphenylphosphonium iodides) with aldehydes and ketones provide a useful route to allylic silicon compounds. The β-silyl Wittig reagents prepared and utilized in this study include Pha3P=CHCH2SiMe3, Ph3P=C(CH3)CH2,SiMe3, Ph3P=C(C6H5)CH2SiMe3, Ph3P=CHCH2SiMe2H, Ph3P=CHCH2SiMe2OSiMe3 and Ph3P=CHCH2SiMe-(OSiMe3)2. © 1979.