Abstract:
A process for the production of o-cyano-phenyl and o-cyanobenzoisothiazolyl, azo-p-aminobenzene dyes by replacing a bromine atom in the ortho-position by the cyano group through reaction with a heavy metal cyanide, particularly cuprous cyanide, in an aqueous medium and at elevated temperature.
Abstract:
IN WHICH ONE X is chloro and the other X is hydrogen or each X is chloro; and WITH AIR OR OXYGEN OR WITH 10 TO 30% BY WEIGHT NITRIC ACID TO FORM THE CORRESPONDING CARBOXYLIC ACID FOLLOWED BY CYCLIZATION OF THE LATTER. 1-CHLOROANTHRAQUINONE-2,3-DICARBOXYLIC ANHYDRIDE OR 1,4-DICHLOROANTHRAQUINONE-2,3-DICARBOXYLIC ANHYDRIDE IS OBTAINED IN A GOOD YIELD. Each is a valuable dye intermediate.
A process for the production of an anthraquinone-2,3dicarboxylic anhydride bearing chlorine as a substituent in the 1-position or in the 1- and 4-positions by oxidation of a trimethyl compound of the formula:
Abstract:
Azo dyes derived from ortho-oxdiazolylaniline diazo components and from coupling components containing a hydroxy group or an enolizable keto group in ortho- or para-position to the azo bridge. The dyes are yellow to red and are useful as disperse dyes and particularly as pigments. The pigments give fast colorations in printing inks, resins and surface coatings.
Abstract:
The production of 3,6-dihalodiphenylalkanes by reaction of a diphenylalkane with a halogen and the novel 3,6dihalodiphenylalkanes themselves. The new compounds which can be prepared according to the process of the invention may be used as dispersing agents in dye/styrene mixtures and also as dyeing auxiliaries. They are also valuable starting materials for the production of dyes and pesticides.
Abstract:
Azo disperse dyes containing an N-substituted 3-amino-6nitrophthalimide as diazo component and an aniline coupling component. The dyes give yellow to blue colorations particularly on polyesters; these colorations have good fastness properties. In which