Davis, Andrew M. and Page, Michael I. (1985) Opening of the thiazolidine ring of penicillin derivatives. Chemical Communications (23). pp. 1702-1704. ISSN 1359-7345

Penicilloic acid derivatives undergo two types of reversible thiazolidine ring opening reactions; in aqueous alkaline solution methyl benzylpenicilloate ring opens to give an enamine intermediate by a base-catalysed elimination process involving C-6-H whereas benzylpenicilloic acid epimerises at C-5 by unimolecular ring opening to form an intermediate iminium ion

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