Process for preparation of asymmetric isoindoline pigments

Details Process for preparation of asymmetric isoindoline pigments Process for preparation of asymmetric isoindoline pigments

C - Chemistry, Metallurgy

09

B

C09B 57/04 (2006.01)

Patent

CA 2065915

Mo3606CIP MD-91-18-PG-CIP PROCESS FOR PREPARATION OF ASYMMETRIC ISOINDOLINE PIGMENTS ABSTRACT OF THE DISCLOSURE This invention relates to a process for preparing asymmetric isoindoline pigments of the formula Image in which R1 is an electron-withdrawing group, R2 and R3 are independently hydrogen, alkyl, or aryl, and R4, R5, R6, and R7 are independently hydrogen, halogen, alkyl, alkoxy, or aryloxy. The process employs an initial reaction of a 1,2-dicyanobenzene with an alcohol in an organic medium in the presence of a base. The resultant imino-isoindoline intermediate composition reacts without isolation with a cyanomethylene compound NC-CH2-R1 to form a partly condensed product that is then condensed, optionally without isolation, in the presence of water with barbituric acid or a derivative thereof to form the asymmetric isoindoline pigment. Mo3606CIP

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