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2,3-Bis(bromomethyl)-5,6-dicyanopyrazine can be prepared more readily by the condensation of DAMN and 1,4-dibromobutane-2,3-dione than by direct bromination of 2,3-dimethyl-5,6-dicyanopyrazine. The Wittig reaction of with arylaldehydes gave a new type of fluorescent styryl dyes. These styryl dyes have extended π-conjugation systems and strong intramolecular charge-transfer chromophoric systems....
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