N.m.r. spectra of fresh solutions of 1,4-benzoquinone and various, mainly chloro-substituted, derivatives in liquid ammonia are consistent with nucleophilic addition at one or both carbonyl carbon atoms and not at C(2), or equivalent positions, expected in Michael-type addition.
J. A. Chudek, R. Foster and F. J. Reid, J. Chem. Soc., Chem. Commun., 1983, 726 DOI: 10.1039/C39830000726
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