Synthesis, structure, and alkynylation reactivity of alkynyl-silicate, -germanate, and -stannate.

The first anionic pentacoordinated group 14 compounds bearing a phenylethynyl substituent were successfully synthesized and crystallographically characterized. The synthesized ate-type compounds were stable in air, water, and some acids, allowing their application as reagents for the nucleophilic alkynylation of carbon electrophiles.