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CAS No 596-01-0 , 3,3-bis(4-hydroxynaphthalen-1-yl)-2-benzofuran-1-one

  • Name: 3,3-bis(4-hydroxynaphthalen-1-yl)-2-benzofuran-1-one
  • Synonyms: ST50308361; AC1L2AVP; 1-Naphtholphthalein; naphtholphthalein blue; 596-01-0;alpha-Naphtholphthalein;3,3-bis(4-hydroxynaphthalen-1-yl)-2-benzofuran-1-one; Naphtholphthalein; a-naphtholphthalein;
  • CAS Registry Number:
  • Melting Point: 238-240 ºC
  • Density: 1.404 g/cm3
  • Refractive index: 1.769
  • Water Solubility: Insoluble.
  • Safety Statements: R36/37/38
  • Hazard Symbols: Xi: Irritant;
  • HS Code: 32041900
  • EINECS: 209-875-5
  • Molecular Weight: 418.44012
  • InchiKey: HQHBAGKIEAOSNM-UHFFFAOYSA-N
  • InChI: InChI=1S/C28H18O4/c29-25-15-13-23(17-7-1-3-9-19(17)25)28(22-12-6-5-11-21
    (22)27(31)32-28)24-14-16-26(30)20-10-4-2-8-18(20)24/h1-16,29-30H
  • Risk Statements: S26;S36
  • Molecular Formula: C28H18O4
  • Molecular Structure:CAS No:596-01-0 3,3-bis(4-hydroxynaphthalen-1-yl)-2-benzofuran-1-one

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596-01-0 Alpha-Naphtholphthalein

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References of 3,3-bis(4-hydroxynaphthalen-1-yl)-2-benzofuran-1-one
Title: a-Naphtholphthalein
CAS Registry Number: 596-01-0
CAS Name: 3,3-Bis(4-hydroxynaphthalenyl)-1(3H)-isobenzofuranone
Synonyms: 3,3-bis(4-hydroxy-1-naphthyl)phthalide; di-p-a-naphtholphthalide; p-a-naphtholphthalein
Molecular Formula: C28H18O4
Molecular Weight: 418.44
Percent Composition: C 80.37%, H 4.34%, O 15.29%
Literature References: Prepn: Werner, J. Chem. Soc. 113, 20 (1918). Commercial prepn contains a small amount of the isomeric 3,3-bis(2-hydroxy-1-naphthyl)phthalide.
Properties: Colorless powder when pure; usually grayish-red. mp 253-255°. Practically insol in water. Sol in alcohol.
Melting point: mp 253-255°
Use: As indicator in 0.1% or 0.04% soln in alc. pH 7.3 colorless to reddish; 8.7 greenish to blue. Particularly adapted for weak acids in strong alcoholic soln.