The product from the interesting rearrangement of penicillins with methyl chloroformate has been shown to have the structure and stereochemistry (X) by total stereospecific synthesis; this is in keeping with mechanistic considerations.
C. J. Veal and D. W. Young, J. Chem. Soc., Chem. Commun., 1974, 266 DOI: 10.1039/C39740000266
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