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Reactions of hydrazoic acid with aromatic compounds in the presence of both trifluoromethanesulphonic acid and trifluoroacetic acid efficiently gave primary arylamines by a concerted process involving nucleophilic attack of the aromatic compound on the conjugate acid of the azide and elimination of N2 from the conjugate acid.
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Takeuchi et al. (1991) studied this question.
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