Reaction of heteryl-silanes and -germanes with metal hydrides

A series of heteryl-silanes and -germanes¹ 1 The names heterylsilanes and heterylgermanes were used by us to denote respectively silanes and germanes containing a heterocyclic substituent, in our case these are the {A figure is presented} and {A figure is presented} groups. containing a different number of dihydrofuryl and dihydropyranyl groups at the metal atom has been obtained by means of the lithium synthesis. Subsequent substitution of heteryl group for hydride ion occurs during the reaction of the compounds formed with LiAlH₄. The hydrides and boron hydrides of lithium and sodium are able to eliminate the dihydrofuryl group from the most reactive bis[2-(4,5-dihydrofuryl)]methyl-silane (7). The reaction of tris-heteryl-silanes and -germanes with LiAlH₄ gives [2-(4,5-dihydrofuryl)]methylsilane (12), [2-(5,6-dihydro-4H-pyranyl)]methylsilane (14) and [2-(4,5-dihydrofuryl)]methylgermane (13) in good yields, which are otherwise difficult to obtain.