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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(0.1% IN CA. 50% ETHANOL)[FOR PH DETERMINATION]

  • Hong kong Advanced Technology & Industrial Co., Ltd. [Manufacturer]
  • Tel: (852) 2390 2293/ (852) 2394 5546
  • Fax: (852) 2789 8314
  • Address: Unit B, 1/F., Cheong Shing Bldg.,
    17 Walnut St., Tai Kok Tsui, Kln,
    Hong Kong null,nullHong kong
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596-01-0 1-NAPHTHOLPHTHALEIN

  • China Hangzhou Jinyi Chemical Co., Ltd. [Manufacturer]
  • Tel: +86-057186504352
  • Fax: +86-057186504352
  • Address: No.271 Hushunan Road,Hangzhou,
    Zhejiang,China 310005 null,nullChina
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596-01-0 1-NAPHTHOLPHTHALEIN

  • Germany ABCR GmbH & Co KG [Manufacturer]
  • Tel: +49 721 95061-0
  • Fax: +49 721 95061-80
  • Address: Im Schlehert 10
    76187 Karlsruhe
    Germany null,nullGermany
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596-01-0 Alpha-Naphtholphthalein

  • India Nile Chemicals [Manufacturers]
  • Tel: +91-(22)-66313162, 23454828
  • Fax: +91-(22)-23454828
  • Address: 202, Matruchhaya, 378/80 Narshi Natha Street, Mumbai, Maharashtra 400 009, Mumbai,MumbaiIndia
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596-01-0 1-NAPHTHOLPHTHALEIN

  • Germany Intatrade Chemicals GmbH [Manufacturer]
  • Tel: +49 3493/605464
  • Fax: +49 3493/605470
  • Address: Intatrade Chemicals GmbH
    Vierzoner Strasse 14
    D-06749 Bitterfeld, Germany null,nullGermany
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596-01-0 Alpha-Naphtholphthalein

  • Japan Nacalai Tesque, Inc. [Manufacturers]
  • Tel: 81 75 251 1723 81-75-251-1730
  • Fax: 81-75-251-1763
  • Address: Nijo Karasuma, Nakagyo-ku Kyoto 604-0855 Japan Nakagyo-ku,KyotoJapan
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596-01-0 A-NAPHTHOLPHTHALEIN

  • United States Dudley Chemical Corp. [Manufacturer]
  • Tel: (732) 886-3100
  • Fax: (732) 886-3688
  • Address: Dudley Chemical Corp.
    125 Kenyon Drive
    Lakewood, NJ 08701 null,nullUnited States
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596-01-0 1-Naphtholphthalein

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596-01-0 1-NAPHTHOLPHTHALEIN

  • United States SYNASIA [Manufacturer]
  • Tel: 732-205-9880
  • Fax: 732-205-1788
  • Address: NJ Office:
    240 Amboy Avenue
    Metuchen NJ 08840 null,nullUnited States
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596-01-0 Alpha-Naphtholphthalein

  • Switzerland Lucerna-Chem AG null
  • Tel: +41 (0)41.420.9636
  • Address: Abendweg 18 CH - 6006 Luzern Switzerland null,nullSwitzerland
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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.