| abstract |
NEW MATERIAL:A compound shown by formula I[R<1> is 1-8C alkyl; R<2> is 1-8C alkyl, 5-7C cycloalkyl, (Cl-, Br- or 1-4C alkyl-substituted)benzyl or phenyl; X<1> and X<2> are 1-8C alkyl, 1-8C alkoxy, F, Cl or Br; m and n are 0-3]. EXAMPLE:3, 3-Bis[2-(p-dimethylaminophenyl)-2-(p-methoxyphenyl)ethenyl]-4,5,6,7- tetrachlorophthalide. USE:A coupler for coloring record material. PREPARATION:A benzophenone derivative shown by formula II is subjected to Grignard reaction or Witting reaction to give an ethylene derivative shown by formula III. Then 2mol of this compound are condensed with 1mol tetrachlorophthalic anhydride in the presence of a dehydrating agent such as acetic anhydride, sulfuric acid, etc. |