Synthesis of sterically congested stabilized phosphorus ylides from acetylenic esters, 4,4,4-trifluoro-1-(2naphthyl)-1,3-butanedione, and triphenylphosphine

Article abstract of DOI:10.1080/10426500701693420

Protonation of the highly reactive 1:1 intermediates, produced in the reaction between triphenylphosphine and dialkyl acetylenedicarboxylates, by 4,4,4-trifluoro-1-(2-naphthyl)-1,3-butanedione leads to vinyltriphenylphosphonium salts, which undergo Michae