Coupling process in the preparation of disazo diimides

Details Coupling process in the preparation of disazo diimides Coupling process in the preparation of disazo diimides

1974-03-18

1976-04-20

Higel, Floyd D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260152, 260140P, C09B 4100

Patent

active

039519430

ABSTRACT:
The coupling of a bis-acetoacetylamino compound and a diazotized aminophthalic acid proceeds rapidly to the disazo stage in an aqueous solution of a cyclic ether such as tetrahydrofuran at about room temperature or below, e.g., from about 10.degree.C. to about 25.degree.C., to form the disazo tetracarboxylic acid in very high yields. The corresponding diimide is formed by reacting the tetracarboxylic acid with two molecular proportions of ammonia or a primary amine.

REFERENCES:
patent: 3382228 (1968-05-01), Ferrari et al.
patent: 3502643 (1970-03-01), Horstmann et al.
patent: 3513153 (1970-05-01), Horstmann et al.
patent: 3526618 (1970-09-01), Horstmann et al.

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