76486-30-1Relevant academic research and scientific papers
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.
