23.
    发明专利
    未知

    公开(公告)号:DE1241444B

    公开(公告)日:1967-06-01

    申请号:DEB0074618

    申请日:1963-12-11

    Applicant: BASF AG

    Abstract: In a process for the production of bicylic carboxylic acid derivatives trans - cyclohexadiene -(3,5) - dicarboxylic acid - (1,2) is reacted at elevated temperature with a dienophilic compound in the presence of an anhydride of an aliphatic carboxylic acid containing two to six carbon atoms. In examples: the dimer of cyclohexadiene-(3,5)-trans-dicarboxylic acid (1,2)-anhydride is obtained by heating the monomer with acetic anhydride or propionic anhydride (1); bicyclo-(2,2,2)-7-octene-2,3,5-tricarboxylic acid anhydride is obtained by heating cyclohexadiene-(3,5)-GAMMA-trans - dicarboxylic acid - (1,2), acrylic acid and acetic anhydride (2); bicyclo - (2,2,2) - 7 - octene - 5 - carbobutoxy - 2,3 - dicarboxylic anydride is obtained in a similar process using butyl acrylate instead of acrylic acid and other acrylic esters including the methanol, ethanol 2-ethyl-hexanol and lauryl alcohol esters are specified (3); bicylo-(2,2,2)- 7 - octene-5-cyano2,3-dicarboxylic acid is obtained similarly using acrylonitrile instead of acrylic acid (4); and bicyclo - (2,2,2) - 7 - octene - 2,3,5,6-tetracarboxylic acid anhydride is obtained similarly using maleic anhydride instead of acrylic acid.

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