78.
    发明专利
    未知

    公开(公告)号:DE2405056A1

    公开(公告)日:1974-08-15

    申请号:DE2405056

    申请日:1974-02-02

    Applicant: HOECHST AG

    Abstract: Benzofuran compounds of the formula WHEREIN E is a bivalent bridging member of the formula S is hydrogen, halogen, lower alkyl, carboxy, sulfo, cyano, lower carboalkoxy, carbonamido, lower mono- or dialkyl carbonamido, sulfonic acid lower alkyl ester, sulfonamido, lower mono- or dialkyl sulfonamido or phenyl; P, Q, T and U are hydrogen or halogen, lower alkyl, lower alkoxy, phenyl, carboxy, cyano, lower carboalkoxy, lower carbo-alkoxy substituted by a member selected from the group consisting of lower alkoxy, lower dialkylamino and lower trialkyl ammonium, carbonamido, lower mono- or di-alkyl carbonamido, sulfo, sulfonic acid lower alkyl ester, sulfonamido or lower mono- or dialkyl sulfonamido or P and Q together or T and U together are lower alkylene or an annellated phenyl ring, and n is 1 to 3. These compounds can be synthetized by a condensation reaction of the corresponding carboxylic acid derivative with an ortho-aminophenol or by HORNER or similar syntheses forming said bridging member. The products are optical brighteners.

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