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Treatment of 2,3,6,7‐tetramethylphenazine with N‐bromosuccinimide under light irradiation afforded in good yield the tetrakis(bromomethyl) derivative. Weakly basic nucleophilic reagents such as thiols, phenols, amines and the azide anion allow the preparation of a variety of functionalized derivatives. Some 2,7‐disubstituted phenazines have also been obtained.
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Lehn et al. (1990) studied this question.
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