| 摘要 |
NEW MATERIAL:The compound of formula I [R<1> and R<5> are nitro or halogen; R<2>, R<3>, R<6> and R<7> are H, nitro or halogen; R<4> and R<8> are amino (derivative); X<+> is quaternary pyridinium derivative]. EXAMPLE:The compound of formula II. USE:A light-absorbing pigment for optical recording medium. PREPARATION:A hydroxyaniline derivative of formula III, etc., is diazotized and the diazo compound is coupled with a naphthol compound of formula IV, etc., to obtain a dihydroxy azo compound. The compound is made to react with chromium acetate and the resultant metal complex is made to react with a quaternary pyridinium derivative of formula V [R<9> and R<10> are H, (substituted) alkyl, vinyl, alkoxy or halogen; R<11> is (substituted) alkyl] to form a salt. |
