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In view of the preparation of heterocyclic polymethine dyes, 2‐(methylpyridyl or quinolyl)‐benz‐X‐azoles were synthesized with the general reaction between carboxylic acids (or derivatives) and o ‐bifunctional compounds. The electronic spectra and the methyl proton chemical shifts are briefly discussed.
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Barni et al. (1977) studied this question.
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