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    42.
    发明专利
    未知

    公开(公告)号：DE1217007B

    公开(公告)日：1966-05-18

    申请号：DEB0069987

    申请日：1962-12-15

    Applicant: BASF AG

    Inventor： DEHNERT DR JOHANNES ,  HANSEN DR GUENTER

    IPC: C09B26/02 ,  C09B26/04 ,  C09B29/32 ,  C09B44/00 ,  C09B44/16

    Abstract: The invention comprises dyes of formula R1 is an ortho-phenylene radical condensed with the hetero ring in the manner indicated by the valance lines, which may be substituted and which is free from ionogenic water-solubilizing groups, R2 is a hydrogen atom or an alkyl or aryl group, R3 is a hydrogen atom or an alkyl group, X is a cyano, carbonamido-substituted carbonamido or carboxyl group and R4 is a benzene radical containing only one nitro group, which is in o-position to the azo group and if desired further substituents but is free from ionogenic water-solubilizing groups. When R2 is a hydrogen atom the dyes of the above formula are tautomeric with the corresponding hydrazone from, i.e. The dyes are prepared by coupling a diazotized o-nitroaniline with a suitable benzimidazole and when R2 is a hydrogen atom the dyes may be alkylated. The dyes may be used to dye and print mordanted cotton, leather, cellulose ester and ether, polyamide, polyester and polyurethane materials in yellow and orange shades. Examples describe the preparation of the dyes by coupling process.ALSO:1,3 - dimethyl - 2 -carboxylicamidomethylenebenzimidazoline is prepared by treating 1,3-dimethyl - 2 - cyanomethylenebenzimidazoline with 96% sulphuric acid at below 25 DEG C. for 2 hours, mixing with ice and neutralising with caustic soda.

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