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CAS No 125-31-5 , 4-[3-(4-hydroxy-2,5-dimethylphenyl)-1,1-dioxo-2,
1λ

  • Name: 4-[3-(4-hydroxy-2,5-dimethylphenyl)-1,1-dioxo-2,
    1λ
  • Synonyms: 6-benzoxathiol-3-yl]-2,5-dimethylphenol;Xylenol Blue; p-Xylenolsulfonephthalein; 125-31-5; p-Xylenolsulfonphthalein;4-[3-(4-hydroxy-2,5-dimethylphenyl)-1,1-dioxo-2,
    1λ p-Xylenesulfonephthalein; p-Xylenolsulfophthalein;
  • CAS Registry Number:
  • Melting Point: 212°C (dec.)
  • Density: 1.346 g/cm3
  • Refractive index: 1.627
  • Safety Statements: R36/37/38:Irritatingtoeyes,respiratorysystemandskin.;
  • Hazard Symbols: Xi:Irritant;
  • EINECS: 204-736-5
  • Molecular Weight: 410.48278
  • InchiKey: MGUKYHHAGPFJMC-UHFFFAOYSA-N
  • InChI: InChI=1S/C23H22O5S/c1-13-11-20(24)15(3)9-18(13)23(19-10-16(4)21(25)12-14
    (19)2)17-7-5-6-8-22(17)29(26,27)28-23/h5-12,24-25H,1-4H3
  • Risk Statements: S24/25:Avoidcontactwithskinandeyes.;
  • Molecular Formula: C23H22O5S
  • Molecular Structure:CAS No:125-31-5 4-[3-(4-hydroxy-2,5-dimethylphenyl)-1,1-dioxo-2,<br />1λ

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References of 4-[3-(4-hydroxy-2,5-dimethylphenyl)-1,1-dioxo-2,
1λ
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
Synonyms: 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.