The pyrimidinium-4-olates of type (1) or (3) are photochemically isomerized into the novel bis(β-lactams)(2) or (4), respectively, and the bis(β-lactam)(2a) could be further converted into two monocyclic β-lactams.
H. Gotthardt and K. Schenk, J. Chem. Soc., Chem. Commun., 1986, 687 DOI: 10.1039/C39860000687
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