Easily prepared cyclic semicarbazides are oxidised by cupric chloride, in high yield and a single step, to cis-azoalkane–cuprous chloride complexes and isocyanates.
M. Heyman, V. T. Bandurco and J. P. Snyder, J. Chem. Soc. D, 1971, 297 DOI: 10.1039/C29710000297
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