Xylenol Blue
Title: Xylenol Blue
CAS Registry Number: 125-31-5
CAS Name: 4,4¢-(3H-2,1-Benzoxathiol-3-ylidene)bis[2,5-dimethylphenol] S,S-dioxide
Additional Names: p-xylenolsulfonephthalein; 1,4-dimethyl-5-hydroxybenzenesulfonephthalein; a,4,4¢-trihydroxy-2,5,2¢,5¢-tetramethyltriphenylmethane-2¢¢-sulfonic acid g-sultone
Molecular Formula: C23H22O5S
Molecular Weight: 410.48
Percent Composition: C 67.30%, H 5.40%, O 19.49%, S 7.81%
Literature References: Prepd from o-sulfobenzoic acid dichloride or o-sulfobenzoic acid anhydride and p-xylenol in the presence of zinc chloride: Cohen, Biochem. J. 16, 31 (1922).
Properties: Brown crystals from alcohol.
Use: Indicator, used in 0.02% soln: pH 1.2 red, 2.8 yellow, 9.6 blue.

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