The presence of cis–trans isomerism at ambient temperatures in bis(trihalogenoacetyl)polymethylbenzenes (1)–(3) is demonstrated for the first time by the observation of separate 1H n.m.r. signals.
A. G. Pinkus and N. Kalyanam, J. Chem. Soc., Chem. Commun., 1978, 201 DOI: 10.1039/C39780000201
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