NON-CARBONIUM ION CHARACTER OF THE INTERMEDIATE IN THE PUMMERER REACTION OF PHENYLSULFINYLCYCLOPROPANES AND (PHENYLSULFINYLMETHYL)CYCLOPROPANE WITH ACETIC ANHYDRIDE
The Pummerer reaction of phenylsulfinylcyclopropanes and (phenylsulfinylmethyl)cyclopropane with acetic anhydride afforded 1-acetoxy-1-(phenylmercapto)cyclopropanes and (α-acetoxyphenylmercaptomethy1)cyclopropane in high yields unlike in the acetolysis of 1-chloro-1-(phenylmercapto)cyclopropanes. Thus, the Pummerer reaction is considered to proceed via an ylide-ylene-ion pair.