Abstract

Protonation of the highly reactive 1:1 intermediates, produced in the reaction between tertiary phosphines (triphenylphosphine and tributylphosphine) and alkyl acetylenecarboxylates, by alcohols (2,2,2-trichloroethanol, propargyl alcohol, and 4- (trifluoromethyl)-benzyl alcohol) leads to vinyltriphenylphosphonium salts, which undergo addition-elimination reaction to produce the corresponding   O-vinyl ethers.3 as solvent) indicated that the compounds contained twoO-vinyl ether. The relative populations of stereoisomers were1H NMR spectra The NMR spectra (CDCl stereoisomers for each determined from their