Abstract

Triarylbis(phenylethynyl)antimony (V) ( 1a - 1c ) were synthesized from triarylantimony dibromide and lithium phenylacetylide. Thermolytic reductive elimination of 1a - 1c took place at 110 °C and the aryl-alkynyl coupling product ( 3 ) increased as the aryl group became more electronegative. The result is consistent with the apical-apical coupling from the trigonal bipyramidal structures, which was predicted to be symmetry-allowed by Hoffmann.

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