Tropaeolin O
Title: Tropaeolin O
CAS Registry Number: 547-57-9
CAS Name: 4-[(2,4-Dihydroxyphenyl)azo]benzenesulfonic acid monosodium salt
Additional Names: C.I. Acid Orange 6; sodium p-(2,4-dihydroxyphenylazo)benzenesulfonate; sodium azoresorcinolsulfanilate; C.I. Food Yellow 8; C.I. 14270; Resorcinol Yellow; Yellow T; Tropeolin O; Tropaeolin R; Chrysoine; Gold Yellow
Molecular Formula: C12H9N2NaO5S
Molecular Weight: 316.27
Percent Composition: C 45.57%, H 2.87%, N 8.86%, Na 7.27%, O 25.29%, S 10.14%
Literature References: Prepd from resorcinol and a p-sulfobenzenediazonium salt, followed by reaction with an inorganic sodium salt: Sisley, Bull. Soc. Chim. Fr. [3] 25, 869 (1901). See also: Colour Index vol. 4 (3rd ed., 1971) p 4064. Brief review: H. J. Conn's Biological Stains, R. D. Lillie, Ed. (Williams & Wilkins, Baltimore, 9th ed., 1977) p 106.
Properties: Brown powder. Sol in water with reddish-yellow color; sol in alcohol.
Use: As indicator. pH: yellow 11, orange-brown 12.7. Occasionally used as plasma stain.

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