Iridium complex catalyzed germylative coupling reaction between alkynes and iodogermanes - a new route to alkynylgermanium and alkynylgermasilicon compounds

摘要

The new reaction of terminal alkynes with iodogermanes proceeding in the presence of an Ir~I-complex [{Ir(μ-Cl)(CO)_2}_2] (I) and NEt(~iPr)_2, as a hydrogen iodide acceptor, leads to the formation of functionalized alkynylgermanes. This reaction occurs via direct activation of the C_(sp)-H bond in the starting alkyne. Detailed stoichiometric experiments using [Ir(cod)(CCPh)(PCy_3)] (IVa) and iodogermane were performed and resulted in a proposal of a reasonable mechanism for the germylative coupling reaction between alkynes and iodogermanes.