Proximity effects in diaryl derivatives. Part III. The formation of phenazines and dibenzothiadiazepines by reduction of 2,2′-dinitrodiaryl sulphides, sulphoxides, and sulphones
作者:M. F. Grundon、B. T. Johnston
DOI:10.1039/j29660000255
日期:——
Reduction of 2,2′-dinitrodiaryl sulphides, sulphoxides, and sulphones with zinc and sodium hydroxide in aqueous dioxan afforded phenazines (V), dibenzo[b,f][1,4,5]thiadiazepines (IV; X = S or SO2), dibenzo[b,f][1,4,5]-thiadiazepine N-oxides, and other products. Phenazines arise by intramolecular nucleophilic rearrangement of a partially reduced species, followed by loss of the sulphur-containing group