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    • 33. 发明授权
    • Preparation of optical brighteners
    • 荧光增白剂的制备
    • US4380514A
    • 1983-04-19
    • US214227
    • 1980-12-08
    • Guenther Seybold
    • Guenther Seybold
    • C07C69/767C07C255/50C07C255/51C09B23/00C09B57/00C09K3/00C11D3/42D06L3/12C07C121/64
    • C07C255/00D06L3/125
    • A process for the preparation of unsymmetrically substituted optical brighteners of the general formula ##STR1## where X and Y independently of one another are hydrogen, fluorine, chlorine, cyano, C.sub.1 -C.sub.10 -alkoxycarbonyl, unsubstituted or substituted carbamyl or sulfamyl, a sulfonic acid aryl ester group, C.sub.1 -C.sub.10 -alkylsulfonyl or phenylsulfonyl, and at least one of X and Y is not hydrogen, and of mixtures of such optical brighteners, wherein terephthalaldehyde is reacted successively with a compound of the general formula IIa ##STR2## and a compound of the general formula IIb ##STR3## where X and Y have the above meanings and alkyl is preferably C.sub.1 -C.sub.4 -alkyl, in the presence of an alkali, in a solvent from which the monocondensation product precipitates.
    • 制备通式“I”的不对称取代的荧光增白剂的方法,其中X和Y彼此独立地是氢,氟,氯,氰基,C 1 -C 10 - 烷氧基羰基,未取代或取代的氨甲酰基或磺酰胺基,磺酸基 酸式芳基酯基,C 1 -C 10 - 烷基磺酰基或苯基磺酰基,并且X和Y中的至少一个不是氢,以及这些荧光增白剂的混合物,其中对苯二甲醛依次与通式IIa化合物IIa 和具有上述含义的通式IIb的化合物,其中X和Y具有上述含义,并且烷基优选为C1-C4烷基,在碱的存在下,在单链体产物沉淀的溶剂中。