The first reactions of chlorosulphonyl isocyanate with cyclohexadienes involve primary addition to yield N-chlorosulphonyl β-lactams followed by secondary and tertiary dipolar rearrangements; evidence for the intermediacy of a true dipole in β-lactam formation is presented.
J. R. Malpass and N. J. Tweddle, J. Chem. Soc., Chem. Commun., 1972, 1247 DOI: 10.1039/C39720001247
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