Carboncarbon and carbonchalcogen spinspin coupling constants in chalcogen-substituted acetylenes

Abstract

CarbonCarbon and carbonchalcogen spinspin coupling constants have been determined for chalcogen-substituted phenyl-, alkyl- and silyl-acetylenes. The changes in the CC couplings involving acetylenic sp carbons are explained in terms of the electronegativities of the substituent. The chalcogen-carbon coupling dependence on carbon hybridization previously noted for tellurium derivatives is confirmed.