The decomposition of 1,4-dimethoxybenzene cation (2a) and 1,4-dimethoxy-2,5-dimethylbenzene cation (2b) gave 2,2′,5,5′-tetramethoxydiphenyl and 2,5-dimethyl-p-benzoquinone indicating that the reaction pathway depends on substituent at nucleus of the radical cations 2.
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Nishinaga et al. (1974) studied this question.
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