1,2-Bis-(1-methyl-3-oxobutylideneamino)ethane on treatment with thiosemicarbazides yields bisthiosemicarbazones of pentane-2,4-dione. It is suggested that reaction takes place via a 1,4-diazepine intermediate. 1,4-Diazepine derivatives yield similar bisthiosemicarbazones on reaction with thiosemicarbazides.
C. N. O'Callaghan and D. Twomey, J. Chem. Soc. C, 1967, 2400 DOI: 10.1039/J39670002400
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