the reaction of HMPT-Li with the benzoylmethylenetriphenylphosphorane Ph3PCHCOPh reacts with aliphatic ketones, in contrast to its precursor. This condensation makes it possible to prepare β,γ-unsaturated ketones, of type RCHC(R′)CH2COPh, instead of the α,β isomer usually obtained in a Wittig reaction.
HM
PT-Li与
苯甲酰基亚甲基三苯基膦烷Ph 3PphenylCHCOPh反应制得的烯醇盐内酯Ph 3 P + C - C(Ph)O - Li +与脂族酮反应,与其前体相反。该缩合使得能够制备β,γ不饱和酮,型RCHC(R')CH的2 COPh,代替α,β在维蒂希反应通常同分异构体而获得。