5,6-trans-Penem compounds were photochemically transformed via isomerisation at C(5) to 5,6-cis-penems, the structures of which were confirmed by spectroscopic and X-ray crystallographic analysis.
H. Iwata, R. Tanaka, S. Imajo, Y. Oyama and M. Ishiguro, J. Chem. Soc., Chem. Commun., 1991, 285 DOI: 10.1039/C39910000285
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