NEW BIS(LITHIOMETHYL)SILANES - BUILDING-BLOCKS FOR ORGANOSILANES

The first high yield preparation of non pi-stabilized bis(lithio-methy l)silanes was performed by the reductive cleavage of C-S bonds with el ectron transfer reagents. Bis[(phenylthio)methyl]silanes synthesized b y the reaction of dichlorosilanes with [(phenylthio)methyl]lithium wer e transformed to the corresponding bis(lithiomethyl)silanes 7 by react ion with lithium naphthalenide (LiC10H8) or lithium p,p'-di-tert-butyl -biphenylide (LiDBB) as an electron transfer reagent and were characte rized by their reaction with Bu(3)SnCl. The C-S bonds of bis[(phenylth io)methyl]silanes can be cleaved selectively making possible the intro duction of two different groups. - The silicon atom plays a central ro le in the reactivity of the presented structural types. The bis (lithi omethyl)silanes are used as new building blocks for the preparation of organosilanes, Si-H-functionalized organosilanes, and 1,3-disilacyclo butanes containing SiCH2Si structural units.