Addition of hydrazoic acid to 4-p-nitrophenylbut-3-en-2-one gives 4-azido-4-p-nitrophenylbutan-2-one; acid catalysed decomposition of the latter affords 4-p-nitroanilinobut-3-en-2-one having a cis-configuration at the olefinic double bond.
A. S. R. Donald and R. E. Marks, J. Chem. Soc. C, 1967, 1188 DOI: 10.1039/J39670001188
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