Iridium complex catalyzed germylative coupling reaction between alkynes and iodogermanes--a new route to alkynylgermanium and alkynylgermasilicon compounds
Monika Rzonsowska1, Ireneusz Kownacki, Beata Dudziec
1Faculty of Chemistry, Department of Organometallic Chemistry, Adam Mickiewicz University in Poznan, Umultowska 89b, Poznan 61-614, Poland. Bogdan.Marciniec@amu.edu.pl.
Abstract:
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((i)Pr)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)(PCy3)] (IVa) and iodogermane were performed and resulted in a proposal of a reasonable mechanism for the germylative coupling reaction between alkynes and iodogermanes.
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