Orange B
Title: Orange B
CAS Registry Number: 15139-76-1
CAS Name: 4,5-Dihydro-5-oxo-4-[(4-sulfo-1-naphthalenyl)azo]-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylic acid 3-ethyl ester disodium salt
Additional Names: 5-oxo-4-[(4-sulfo-1-naphthyl)azo]-1-(p-sulfophenyl)-2-pyrazoline-3-carboxylic acid 3-ethyl ester disodium salt; 5-hydroxy-4-[(4-sulfo-1-naphthalenyl)azo]-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylic acid 3-ethyl ester disodium salt; 1-(4-sulfophenyl)-3-ethylcarboxyl-4-(4-sulfonaphthylazo)-5-hydroxypyrazole disodium salt; C.I. Acid Orange 137; C.I. 19235
Molecular Formula: C22H16N4Na2O9S2
Molecular Weight: 590.49
Percent Composition: C 44.75%, H 2.73%, N 9.49%, Na 7.79%, O 24.39%, S 10.86%
Literature References: Prepn: W. H. Kretlow et al., US 3285906 (1966 to Stange Co.). Review: Fed. Regist. 43, 45611 (1978). See also Colour Index vol. 4 (3rd ed., 1971) p 4134.
Properties: Dull orange crystals. Absorption max (0.04N ammonium acetate): 442 nm. Soly in water at 77°: 220 g/l. Violet soln in conc H2SO4, changing to fuchsia then red on dilution. Red soln in conc HCl. Yellowish soln in 10% NaOH, changing to brownish yellow on dilution.
Absorption maximum: Absorption max (0.04N ammonium acetate): 442 nm
Use: In coloring sausage and frankfurter casings.

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