8-Hydroxy-7- quinoline-5-sulfonic acid

The 8-hydroxy-7-aminoquinoline-5-sulfonic acid was used to clarify the role of intramolecular hydrogen bonding on the cyclization rate of hydroxy Schiff bases in the preparation of 2-aryloxazolo[4,5-/i]quinoline-5-sulfonic acids 13. Irradiation... 

Quinoline-5-sulfonic acid, 8-hydroxy-7-iodo-metal complexes absorptiometry, 1,549 Quinolinium salts in gravimetry, 1, 535 Quinolinol metal complexes color photography, 6,107 8-Quinolinol biological activity, 6, 771 gallium and indium complexes radiopharmacology, 6, 971 radionuclide complexes radiopharmacology, 6,994 8-Quinolyl sulfate hydrolysis metal catalysis, 6,465 Quinones... 

Mixed complex formation kinetics between LnEDTA and L, where L stands for 5-sulfosalicylate [74], 8-hydroxy quinoline-5 sulfonate and picolinate [75] were studied and two pathways namely acid-dependent and acid-independent pathways have been identified. The overall reaction stoichiometry may be written as... 

Hydroxymethylation of quinolines.1 Quinolines possessing free 2- and/or 4-positions react with hydroxylamine-O-sulfonic acid in methanol to give hydroxy-... 

Quinoline-5-sulfonic acid, 8-hydroxy-7-iodo-metal complexes absorptiometry, 549 Quinolinium salts in gravimetry, 535 Quinoxaline-2,3-dithiol metal complexes liquid-liquid extraction, 547... 

Unless otherwise stated, the Ps/oai. values were determined in 0.1 M KNO3 solutions at T = 30 °C by pH-potentiometric titrations. "SA, SSA and HQSA = salicylic, 5-sulfosalicylic and 8-hydroxy-quinoline-5-sulfonic acids, respectively oCA, mCA and pCA = 2-hydroxy-n-methylbenzoic acid (n = 3, 4 and 5, respectively). 

Acid solutions of iron salts react with water solutions of 8-hydroxy-7-iodo-quinoline-5-sulfonic acid (I) to produce a green color due to the inner complex anion (II),... 

The color test for iron with 8-hydroxy-7-iodo-quinoline-5-sulfonic acid is selective. The only interference arises from considerable quantities of colored ions or of strong oxidizing agents that partially destroy the reagent. It is important to maintain the acidity at pH 2 to 3.5. Consequently, if stronger or less acid solutions are at hand they must be buffered or acidified until a distinct acid reaction toward methyl orange paper (pH = 3.5) is obtained. 

This mixture is known as Quinoline Yellow A [8003-22-3] (Cl 47000) and is most widely used with polyester fibers (109). Upon sulfonation, the water-soluble Quinoline Yellow S or Acid Yellow 3 [8004-92-0] (Cl 47005) is obtained. This dye is used with wool and its aluminum salt as a pigment. Foron Yellow SE-3GL (Cl Disperse Yellow 64) is the 3-hydroxy-4-bromo derivative. Several other quinoline dyes are commercially available and find apphcations as biological stains and analytical reagents (110). 

Cyclic amines with a great variety of A-substituents have been described, many with biologically significant groups, e.g., imidazolyl. Others include methyl-phosphonic and -phosphinic acids,147 methyl-sulfonate,148 quinolin-2-ylmethyl, anthraquinon-2-ylmethyl, 2-(3-hydroxy-pyridyl)methyl, 2-methoxyethyl,149 2-methylthioethyl,150 thiophenyl, pyrazolyl, etc. 

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