137-51-9Relevant articles and documents
High temperature process for preparing fiber reactive dyes
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, (2008/06/13)
A process for preparing monoazo dyes by coupling a aromatic diazonium salt with an amino-4-hydroxy-naphthalene sulfonic acid derivative at a temperature of 40°-85° C. The process of the invention provides a isomerically purer dye.
Studies of Reactions of Amines with Sulfur Trioxide. VI. Thermal Reactions of Anilinium, Dimethylanilinium, and Trimethylanilinium Salts of Butylamidosulfuric Acid
Kanetani, Fujio,Yamaguchi, Hachiro
, p. 3048 - 3058 (2007/10/02)
When the title compounds were heated in an evacuated reaction vessel, both transsulfonation and rearrangement occurred.At lower temperatures (80-120 deg C) the corresponding phenylamidosulfates and sulfophenylamidosulfates (transsulfonation products) were the main products.Increasing temperature led to the formation of ring mono- and disulfonates (rearrangement products) at the expense of the transsulfonation products.The sulfonate group always migrated to the ortho and/or para position(s) to the amino group.In no case was any meta-product detected.There was no significant difference in the ease of transsulfonation among the anilinium salts studied exept 2,6-dimethyl- and 2,4,6-trimethylanilinium salts.On the other hand, the ease of rearrangement and the orientation of ring sulfonation depended strongly on the structure of the substrate anilines.The thermal reactions of 2,4,6-trimethylanilinium butylamidosulfate produced (2,4,6-trimethylphenylimido)bis(sulfate) in addition to (2,4,6-trimethylphenylamido)sulfate.This is the first isolation of an arylimidobis(sulfate) from such reactions.Mechanisms of the transsulfonation and rearrangement have been discussed.
3-Sulfoalkyl-6-hydroxy-pyrid-(2)-one-containing azo dyestuffs
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, (2008/06/13)
An azo dyestuff of the formula STR1 in which D is benzene or naphthalene, optionally substituted by sulfonic acid, carboxy, hydroxy, halogen, nitro, amino, lower alkylamino, lower alkyl, lower alkoxy, lower alkylsulfonyl, trifluoromethyl, cyano, cyclohexyloxycarbonyl, sulfonic acid-N-lower alkylamide, sulfonic acid N-lower alkoxy-loweralkylamide, lower acylamino, phenylazo, sulfophenylazo, sulfonaphthylazo, β-sulfatoethylsulfonyl, β-sulfatoethylsulfonamido, aminosulfonyloxy and a fibre-reactive radical bound via an amino group; or is thiazole, quinoline, benzthiazole, 6-methylbenzthiazole, 1,3,5-thiadiazole or benzisothiazole; R is hydrogen, lower alkyl, lower halogenalkyl, lower hydroxyalkyl, lower acylamino-lower alkyl, phenyl-lower alkyl, phenyl, halogenphenyl, lower alkoxyphenyl, lower acylaminophenyl, lower acylamino-lower alkyl and amino-lower alkyl, in which the amino group is optionally substituted by a fibre-reactive radical; R' is hydrogen, lower alkyl, phenyl-lower alkyl, phenyl, halogenphenyl and lower alkoxy-phenyl; and V is hydrogen, lower alkyl and phenyl, optionally substituted by halogen, nitro, cyano, amino, lower acylamino and a fibre-reactive radical bound via an amino group; and the heavy metal complex compound thereof, is suitable for dyeing and printing widely different types of materials, such as natural and synthetic polyamide and cellulose materials of fibrous structure. These dyestuffs show an excellent building-up capacity and valuable yellow pure and brilliant shades. The dyeings and prints exhibit a good stability to acids and alkalis, a good fastness to light and a good fastness to wet processing.
