88-22-2Relevant academic research and scientific papers
Sulfonation of arylamines : Part VII-Kinetics of thermal decomposition of tetramethyldianilinium sulfates
Singh, Gurdip,Kapoor, Inder Pal Singh,Singh, Jyotsna
, p. 590 - 595 (2007/10/03)
Tetramethyldianilinium sulfates (TMDAS) have been prepared and characterised. Thermal decomposition of these salts has been studied by TO and kinetics evaluated using Prout-Tompkins equation. Activation energies of these salts are found to be linearly related to the pKa of the corresponding amine. It has been found that TMDAS give dimethylaminobenzenesulfonic acids (DMAB-SA) via solid state reaction induced by heat. A reaction scheme representing the thermal decomposition pathways of these salts has been suggested. The proton transfer (unimolecular elementary reaction) seems to be the primary step which is followed by a bimolecular step (sulfonalion) for the decomposition of these salts.
Reactive dyestuffs comprising a triazine moiety and a vinylsulfonyl moiety both being linked by a substituted alkylene bridge member
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, (2008/06/13)
A reactive dye of the formula STR1 in which: F is a radical selected from the group consisting of metal-free or metal-containing monoazo or disazo dyes containing at least one --SO3 H group, anthraquinone dyes, sulfophthalocyanine dyes, formazan dyes, phenazine dyes, oxazine dyes and nitroaryl dyes, R is hydrogen, C1 -C4 alkyl which is unsubstituted or substituted with --COOH or --SO3 H, cyanoethyl, or hydroxyethyl, X is fluorine, chlorine, bromine, --SO3 H, phenylsulfonyl or C1 -C4 -alkylsulfonyl, p is 1 or 2 and A is a radical of the formula STR2 in which: Y is chlorine, bromine, fluorine, --OH, --OSO3 H, --O-acyl, --CN, --COOH, --COO--C1 -C4 -alkyl, --CONH2 or --SO2 --Z, the group designated "alk" is a straight or branched polymethylene radical having 2 to 6 carbon atoms, V is STR3 hydrogen or C1 -C4 -alkyl which is unsubstituted or substituted by C1 -C2 -alkoxy, carboxyl, sulfo, halogen or hydroxy, Z is β-halogenoethyl, vinyl or β-acetoxyethyl, or A is a radical of the formulae STR4 in all of which R' is C1-6 -alkyl or hydrogen, Z is as defined above, o is 0 to 6, and m is 2 to 6.
Triazinyl reactive dyes containing additional fiber reactive groups bound through the sulfonylalkylaminoalkylamino bridge
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, (2008/06/13)
The invention relates to novel useful reactive dyes of the formula I STR1 in which: F is a radical selected from the group consisting of metal-free or metal-containing monoazo or disazo dyes containing at least one --SO3 H group, anthraquinone dyes, sulfophthalocyanine dyes, formazan dyes, phenazine dyes, oxanine dyes and nitroaryl dyes, R is hydrogen, C1 -C4 alkyl which is unsubstituted or substituted with --COOH or --SO3 H, cyanoethyl, or hydroxyethyl, X is fluorine, chlorine, bromine, --SO3 H, phenylsulfonyl or C1 -C4 -alkylsulfonyl, P is 1 or 2 and A is a radical of the formula STR2 in which: the groups designated "alk" are independently of each other straight or branched polymethylene radicals having 2 to 6 carbon atoms, and Z is β-halogenoethyl, vinyl, β-sulfatoethyl, β-thiosulfatoethyl or βacetoxyethyl.
Process for the preparation of aminoarylsulphonic acids in sulfolene solvent
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, (2008/06/13)
Aromatic aminosulphonic acids which have a reduced content of discoloring by-products are obtained when aromatic amines are reacted with a sulphonating agent in a reaction medium at least some of which consists of tetramethylene sulphone.
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.
