Reaction of 5H-dibenzo[a,d]cyclohepten-5-one (1) with chlorosulphonyl isocyanate (2) results in the unexpected introduction of a carbon substituent at the 4-position of (1), through an assisted electrophilic substitution.
J. Rokach, Y. Girard and J. G. Atkinson, J. Chem. Soc., Chem. Commun., 1979, 892 DOI: 10.1039/C39790000892
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