β-Lactam-cleavage reactions of the 3-exo- and 3-endo-isomers of t-butyl isopenam-3-carboxylate, i.e.(2a) and (3a), and of 3-t-butoxycarbonylisopenam 2,2-dioxide, i.e.(2b) and (3b), induced by trifluoroacetic acid, are not accompanied or followed by 2,3-bond ruptures.
P. H. Crackett, C. M. Pant and R. J. Stoodley, J. Chem. Soc., Chem. Commun., 1983, 1284 DOI: 10.1039/C39830001284
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