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    3.
    发明专利
    未知

    公开(公告)号：DE1176640B

    公开(公告)日：1964-08-27

    申请号：DEB0071420

    申请日：1963-04-05

    Applicant: BASF AG

    Inventor： BOCK DR GUSTAV

    IPC: C07C273/00 ,  C07C275/70 ,  C07D295/215

    Abstract: Cis-trans quinacridone is obtained by heating at 170 DEG C. in an o-dichlorobenzene medium and in presence of p-toluenesulphonic acid, N,N1-bis-diethylcarbamyl - 2,5 - dianilinoterephthalic acid dimethyl ester.ALSO:The invention comprises bis-(N-carbamyarylamino) benzene dicarboxylic acid dialkyl esters in which the arylamino groups, which are ortho to the ester groups, may be substituted by a nitro group or one or more alkyl or alkoxy groups or halogen atoms and the carbamyl radicals may be mono- or di-alkyl or aryl substituted; the compounds are made by heating esters of the bis-isourea ethers of the corresponding dihydroxy benzene dicarboxylic acids at 70-200 DEG C., e.g. as in the following reaction scheme in which R is C1- 4 alkyl, R1 is H o up to two nitro groups, halogen atoms or C1- 4 alkyl or alkoxy groups, R2 and R3 are C1- 4 alkyl, phenyl or naphthyl, or NR2R3 constitutes a 5- to 7-membered ring, while rings A and B are phenyl or naphthyl or are members of an aromatic-heterocyclic system, e.g. 9-methyl carbazyl. The starting materials (e.g. I) are obtained by reacting esters of hydroxy acids with arylimino carbamyl halides and are stated to be novel. Exemplified products are derivatives of bis-(arylamino) isophthalic acid (as in II), or of 2,5-bis-(arylamino) terephthalic acid.

    4.
    发明专利
    未知

    公开(公告)号：DE1236696B

    公开(公告)日：1967-03-16

    申请号：DEB0076575

    申请日：1964-04-29

    Applicant: BASF AG

    Inventor： BOCK DR GUSTAV

    IPC: C09B43/00

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