SCHEDULED MAINTENANCE
The formation of 1,3,4-oxadiazol-2(3H)-ones by thermal cyclisation of 1-acylsemicarbazides has been shown to occur with equal facility by use of readily available N-acylaminobiurets. Cyclisation by thermolysis of S-benzyl 3-acylcarbazates also proceeds smoothly though in lower yields.
K. W. Bentley, M. Burton and B. C. Uff, J. Chem. Soc., Perkin Trans. 1, 1982, 2019 DOI: 10.1039/P19820002019
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