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Acid decomposition of 4-alkyl-5-dialkylamino-1-vinyl-4,5-dihydro-1H-1,2,3-triazoles gave N1,N1-dialkyl-N2-vinylalkanamidines, which have 2-aza-1,3-butadiene skelton, in fair yields.
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Ito et al. (1983) studied this question.
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