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CAS No 1733-12-6 , 4-[3-(4-hydroxy-3-methylphenyl)-1,1-dioxo-2,
1λ

  • Name: 4-[3-(4-hydroxy-3-methylphenyl)-1,1-dioxo-2,
    1λ
  • Synonyms: 1733-12-6;4-[3-(4-hydroxy-3-methylphenyl)-1,1-dioxo-2,
    1λ6-benzoxathiol-3-yl]-2-methylphenol; Cresolsulfophthalein; NSC7224; o-Cresolsulfonephthalein;o-Cresol Red; o-Cresolsulfonphthalein;
  • CAS Registry Number:
  • Melting Point: 290 ºC
  • Density: 1.404 g/cm3
  • Refractive index: 1.652
  • Safety Statements: 24/25
  • Hazard Symbols: Xi: Irritant;
  • HS Code: 29349990
  • EINECS: 217-064-2
  • Molecular Weight: 382.42962
  • InchiKey: OBRMNDMBJQTZHV-UHFFFAOYSA-N
  • InChI: InChI=1S/C21H18O5S/c1-13-11-15(7-9-18(13)22)21(16-8-10-19(23)14(2)12-16)
    17-5-3-4-6-20(17)27(24,25)26-21/h3-12,22-23H,1-2H3
  • Risk Statements: S24/25
  • Molecular Formula: C21H18O5S
  • Molecular Structure:CAS No:1733-12-6 4-[3-(4-hydroxy-3-methylphenyl)-1,1-dioxo-2,<br />1λ

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References of 4-[3-(4-hydroxy-3-methylphenyl)-1,1-dioxo-2,
1λ
Title: Cresol Red
CAS Registry Number: 1733-12-6
CAS Name: 4,4￠-(1,1-Dioxido-3H-2,1-benzoxathiol-3-ylidene)bis[2-methylphenol]
Synonyms: a-hydroxy-a,a-bis(4-hydroxy-m-tolyl)-o-toluenesulfonic acid g-sultone; o-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: M. D. Sohon, Am. Chem. J. 20, 257 (1898); and properties: H. A. Lubs, W. M. Clark, J. Wash. Acad. Sci. 6, 481 (1916). Raman spectrum: K. Machida et al., J. Raman Spectrosc. 8, 172 (1979). Ionization and spectral properties: R. Casula et al., Talanta 40, 1781 (1993); M. C. Aragoni et al., ibid. 42, 1157 (1995). Protein dye binding stoichiometry: I. Molnár-Perl et al., Food Chem. 35, 69 (1990). Use in detection of alkaloids via ion-associates: Z. Skalican et al., Anal. Lett. 28, 1223 (1995); as pH indicator for emission of NO2 in museum collections: J. Fenn, Polym. Prepr. 37, 170 (1996); for archived photographic films: J. C. Harthan et al., Imaging Sci. J. 45, 81 (1997); for microbiological media: L. A. Actis et al., J. Microbiol. Methods 39, 79 (1999).
Properties: Reddish-brown cryst powder. Sol in alcohol. pH 0.2: red; pH 1.8 yellow; pH 7.2 yellow; pH 8.8 reddish-purple.
Use: Acid-base indicator.