A new route to heterocyclic fused 2,5-dihydrothiophene S,S-dioxides: Formation of pyrazole analogues of o-xylylenes

Article abstract of DOI:10.1016/0040-4039(91)80547-J

Addition of diazomethane to 3-phenylsulphonyl-2,5-dihydrothiophene S,S-dioxide 3, followed by base induced aromatisation gives the sulphone 7, a precursor to pyrazole analogues of o-quinodimethane).