PREPARATION AND SI-29 NMR SPECTROSCOPICAL INVESTIGATIONS OF (DIETHYLAMINO)-METHYLCHLOROTETRASILANES AND PENTASILANES

The treatment of several branched methylchlorooligosilanes (Si-4, Si-5 ) with diethylamine leads to a partial or complete substitution of the chloro substituents for diethylamino groups under formation of the fi rst known (diethylamino)-methylchlorooligosilanes containing more than two Si atoms. The condensation of (Et2N)(2)MeSi-SiMeCl(NEt2) (1d) wit h Li in THF yields the linear tetrasilane (Et2N)(2)MeSi-SiMe(NEt2)-SiM e(NEt2)-SiMe(Et2N)(2) (2a). The NMR investigations provided informatio n of the general shift ranges of several Si units in (diethylamino)-me thylchlorooligosilane systems as well as the number of stereoisomers o f the prepared products.