摘要:
The coupling reaction of phenylsulphenyl-, phenylsulphinyl- and phenylsulphonyl-pentadienyl metals 3a-g has been studied showing that while 3c-g couple in any case regioselectively and stereoselectively, the coupling of 3a-b is counteraction and electrophile dependent. The alpha-regioisomeric coupling products of phenylsulphenylpentadienyl metals may undergo [1,5] sigmatropic rearrangement, those of phenylsulphinyl- and phenylsulphonyl-pentadienyl metals give fast double [3,2] sigmatropic isomerization.