3.
    发明专利
    未知

    公开(公告)号:DE2750947A1

    公开(公告)日:1979-05-17

    申请号:DE2750947

    申请日:1977-11-15

    Applicant: HOECHST AG

    Abstract: Compounds of the general formula I in which X represents a trifluoromethyl group or a fluorine atom, n is 1 or 2, Z is an oxygen atom or a NR grouping, in which R is hydrogen or an optionally substituted alkyl group, the benzo rings optionally containing further nonchromophoric substituents. These compounds may be prepared by reacting the dichloride of 1,4-naphthalene-dicarboxylic acid with 2 mols of an o-aminophenol or of an o-nitroaniline and by subsequently cyclizing the acylamino compound obtained. The products are suitable as optical brighteners.

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