摘要:
                                The syntheses of three strained silicon or germanium heterocyclotriynes, from the dilithium dianion of 2,2'-diethynyltolane (Li-2(OBET)) and the dialkyldichlorosilanes or dialkyldichlorogermane, are described. Reactions of the heterocyclynes with Ni(COD)2 give the nickel(0) complexes in very high yield. The heterocyclynes and their nickel complexes have been characterized by a variety of spectral techniques, and the X-ray crystal structures of compounds Si(i-Pr)(2)(oBET), Ni[Si(i-Pr)(2)(OBET)], SiPh2(OBET), Ni[SiPh2(OBET)], GePh2-(OBET), and Ni[GePh2(OBET)] are reported. The heterocyclynes and their nickel complexes possess isomorphous structures.