SCHEDULED MAINTENANCE
Homolytic reductive debromination of a 2β-bromomethyl penam by triphenyltin hydride provides, via ring expansion of the derived 2β-methyl radical, the corresponding cepham system; a similar process may explain the biosynthetic ring expansion of penicillins to cephalosporins.
J. E. Baldwin, R. M. Adlington, T. W. Kang, E. Lee and C. J. Schofield, J. Chem. Soc., Chem. Commun., 1987, 104 DOI: 10.1039/C39870000104
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