Sometimes, the Least Demanding Solution Is the Most Suitable: A Careful Survey of NMR Spectra of a Phosphonium Salt Accounted for Its “Unusual Wittig Reaction”

摘要

Careful product analysis in combination with appropriate supporting experiments unambiguously proves that in contrast to what was previously reported, generation of the phosphonium salt from a β-cyclocitral-derived allylic alcohol and PPh3HBr takes place via a proton-driven elimination/addition path.