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Reactions of aromatic and heteroaromatic compounds bearing electron-acceptor substituents

Research paper by L. I. Belen'kii, N. S. Ksenzhek, Ya. L. Gol'dfarb

Indexed on: 01 Mar '72Published on: 01 Mar '72Published in: Chemistry of Heterocyclic Compounds



Abstract

The specificity of the nitration and bromination of dimethyl(2-thienyl)sulfonium salts was studied. It was found that, in contrast to methyl 2-thienyl sulfide, which reacts to form 3- and 5-substituted derivatives, the sulfonium salts give a mixture of 4- and 5-substituted products. Total suppression of the activity of the α position under the influence of the sulfonium grouping is not observed.