Decomposition of the diazo hydrazides (1b–h) in boiling benzene in the presence of a catalytic amount of rhodium(II) acetate gives the corresponding 1,2-diazetidinones (2) in good yield. The aza-β-lactams (2) exhibit the expected high frequency carbonyl stretch (1 783–1 820 cm–1) in their i.r. spectra.
G. Lawton, C. J. Moody and C. J. Pearson, J. Chem. Soc., Perkin Trans. 1, 1987, 899 DOI: 10.1039/P19870000899
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