Abstract
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 countercation and electrophile dependent. The α-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.
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