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The condensation of halogenated 2,4-, 2,5-, and 2,6-dimethoxytropones with guanidine afforded the 2-amino-5-methoxy-1,3-diazazulenes. This can be explained in terms of the electronic control of nucleo...philic attacking site by remote methoxyl group. This was also the case for the products, 4-bromo-6-hydroxy-7-methoxy-1,3-diazazulenes, in the reactions of 2,4,7-tribromo-5-methoxytropone with acetoamidine and with benzamidine.続きを見る
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