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The preparation of aryl‐azo‐azulenes and aryl‐azo‐guai‐azulenes with aryl = phenyl, α‐naphthyl, β‐naphthyl, α‐anthryl, and β‐anthryl is described. The absorption spectra and the basicity of these compounds have been recorded.
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Gerson et al. (1958) studied this question.
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