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CAS No 2303-01-7 , 4-[3-(4-hydroxy-2-methylphenyl)-1,1-dioxo-2,
1λ Search by region : Germany

  • Name: 4-[3-(4-hydroxy-2-methylphenyl)-1,1-dioxo-2,
    1λ
  • Synonyms: ST50307113; 2303-01-7; NSC9607;6-benzoxathiol-3-yl]-3-methylphenol; m-Cresolsulfonphthalein; m-Cresolsulfonephthalein; Metacresol Purple; Cresol purple;m-Cresol purple;4-[3-(4-hydroxy-2-methylphenyl)-1,1-dioxo-2,
    1λ
  • CAS Registry Number:
  • Density: 1.404 g/cm3
  • Refractive index: 1.668
  • Safety Statements: S24/25
  • EINECS: 218-960-6
  • Molecular Weight: 382.42962
  • InchiKey: OLQIKGSZDTXODA-UHFFFAOYSA-N
  • InChI: InChI=1S/C21H18O5S/c1-13-11-15(22)7-9-17(13)21(18-10-8-16(23)12-14(18)2)
    19-5-3-4-6-20(19)27(24,25)26-21/h3-12,22-23H,1-2H3
  • Risk Statements: S24/25
  • Molecular Formula: C21H18O5S
  • Molecular Structure:CAS No:2303-01-7 4-[3-(4-hydroxy-2-methylphenyl)-1,1-dioxo-2,<br />1λ

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References of 4-[3-(4-hydroxy-2-methylphenyl)-1,1-dioxo-2,
1λ
Title: Cresol Purple
CAS Registry Number: 2303-01-7
CAS Name: 4,4￠-(1,1-Dioxido-3H-2,1-benzoxathiol-3-ylidene)bis[3-methylphenol]
Synonyms: m-cresolsulfonphthalein
Molecular Formula: C21H18O5S
Molecular Weight: 382.43
Percent Composition: C 65.95%, H 4.74%, O 20.92%, S 8.38%
Literature References: pH sensitive dye. Prepn: W. R. Orndorff, A. C. Purdy, J. Am. Chem. Soc. 48, 2212 (1926). Solvent effects: J. Barbosa et al., Mikrochim. Acta 106, 327 (1992). Ionization and spectral properties: R. Casula et al., Talanta 40, 1781 (1993); M. C. Aragoni et al., ibid. 42, 1157 (1995). Titrimetric determn: K. Vytras et al., Analyst 114, 479 (1989). Use as pH indicator for emission of NO2 in museum collections: J. Fenn, Polym. Prepr. 37, 170 (1996); in wine: E. N. Gaiao et al., Analyst 124, 1727 (1999); in buffered solns: S. Paula et al., Biochemistry 38, 3025 (1999).
Properties: Slightly sol in ethanol; sol in ethanol denatured with 10% methanol. pH 1.2 red; pH 2.8 yellow; pH 7.4 yellow; pH 9.0 purple.
Use: Acid-base indicator.