On the trapping of sulphenic acids from penicillin sulphoxides

Abstract
The intermediate sulphenic acids produced thermally from penicillin sulphoxides can be trapped either intramolecularly, as in the rearrangement of the 2β-acetoxymethyl derivatives into the 2α-acetoxymethyl isomers, or intermolecularly with norbornadiene or dihydropyran.

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