Studies on Acetylenic Compounds. LIX. Reactions of Acetylene Sulfonium Ylids with α, β-Unsaturated Esters

Novel 2-ethynylcyclopropanecarboxylates were synthesized by the reaction of acetylene sulfonium ylids with α, β-unsaturated esters. An unequivocal synthesis and degradation were performed to determine the structure and stereochemistry.