An atom-economic method of preparing allylic sulfones via hydrosulfonylation of allenes with sulfinic acids under Pd(0)-catalysis was reported. This process has a high degree of regio- and stereoselectivity, and provides the target product with a moderate to excellent yield. A wide range of nitrogen- or oxygen-containing linear E-allylic sulfones have been synthesized. With the support of experimental
It was revealed by X-ray crystallography that α-unsubstituted (E)-vinyl sulfones have syn-conformation which seems to be the cause of “syn-effect” found in the conversion of (E)-vinyl sulfones to the corresponding allyl sulfones with a base under mild conditions. Syn-conformation of a terminal olefin in solid state was also confirmed.