76486-28-7Relevant academic research and scientific papers
Method for enhancing alkali resistance and oxidation resistance of benzoisothiazole disperse dyes
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Paragraph 0099-0105; 0107; 0256-0264, (2020/12/10)
The invention discloses a method for enhancing alkali resistance and oxidation resistance of benzoisothiazole disperse dyes, and belongs to the technical field of textiles. The method starts from thestructural design of the dye; an azo alkali-resistant disperse dye taking the benzoisothiazole as a diazo component is synthesized; different groups are introduced into the coupling component to enhance the alkali resistance and oxygen bleaching resistance of the heterocyclic azo disperse dye, so that a series of benzoisothiazole disperse dyes with alkali resistance and oxidation resistance strength difference gradients are obtained; the disperse dye capable of meeting the requirements of a polyester-cotton blended fabric bleached cotton and disperse dyeing polyester one-bath process or a polyester fabric alkali deweighting and disperse dyeing one-bath process is determined, and a reference can be provided for the structural design of alkali-resistant and oxidation-resistant disperse dyes.
Reactions of 3-Amino-2,1-benzothiazole and 3-Aminoindazole with Nitrosonium Hydrogen Sulfate and Nitric Acid in Concentrated Sulfuric Acid
Gorelik,Lomzakova,Khamidova,Kuznetsova
, p. 1682 - 1689 (2007/10/03)
Successive treatment of 3-amino-2,1-benzothiazole in concentrated sulfuric acid by nitrosonium hydrogen sulfate and nitric acid results in formation of 2,1-benzothiazole-3-diazonium ion which undergoes nitration to yield 7-nitro-2,1-benzothiazole-3-diazonium ion as the sole product. A similar reaction with 3-amino-1H-indazole yields preferentially 7-nitro- and 1-nitro-1H-indazole-3-diazonium ions, the 7-nitro isomer prevailing. Nitration of the nondiazotized amines under the same conditions affords mainly corresponding 5-nitro derivatives. The diazonium salts formed as the major and minor products were identified by 13C and 1H NMR spectroscopy and by diazo coupling products.
EFFECT OF BENZANNELLATION ON THE COLOR OF p-AMINOAZO COMPOUNDS
Gorelik, M. V.,Lomzakova, V. I.
, p. 1641 - 1646 (2007/10/02)
Monoazo dyes containing a naphthalene ring were obtained by diazotization of 1-amino-4-nitro-2-naphthonitrile, 3-amino-5-nitronaphthoisothiazole, and 3-amino-5-nitrobenzoindazole and coupling of the diazonium salts with N,N-dialkyl derivatives of anilines.Their visible spectra were compared with the spectra of the corresponding benzene analogs.Annellation of the benzene ring in the residue of the diazo component gives rise to a bathochromic or hypsochromic shift, depending on the structure of the dye.The nature of the observed effects is discussed.
