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CAS No 148-25-4 , 4,5-dihydroxynaphthalene-2,7-disulfonic acid

  • Name: 4,5-dihydroxynaphthalene-2,7-disulfonic acid
  • Synonyms: Chromotropic acid; 4,5-dihydroxynaphthalene-2,7-disulfonic acid;4,5-dihydroxynaphthalene-2,7-disulfonic acid; 148-25-4; CHEBI:1751; 4,5-Dihydroxy-2,7-naphthalenedisulfonic acid;
  • CAS Registry Number:
  • Density: 1.929 g/cm3
  • Refractive index: 1.756
  • EINECS: 205-712-7
  • Molecular Weight: 320.29572
  • InchiKey: HLVXFWDLRHCZEI-UHFFFAOYSA-N
  • InChI: InChI=1S/C10H8O8S2/c11-8-3-6(19(13,14)15)1-5-2-7(20(16,
    17)18)4-9(12)10(5)8/h1-4,11-12H,(H,13,14,15)(H,16,17,18)
  • Molecular Formula: C10H8O8S2
  • Molecular Structure:CAS No:148-25-4 4,5-dihydroxynaphthalene-2,7-disulfonic acid

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References of 4,5-dihydroxynaphthalene-2,7-disulfonic acid
Title: Chromotropic Acid
CAS Registry Number: 148-25-4
CAS Name: 4,5-Dihydroxy-2,7-naphthalenedisulfonic acid
Synonyms: 1,8-dihydroxynaphthalene-3,6-disulfonic acid
Molecular Formula: C10H8O8S2
Molecular Weight: 320.30
Percent Composition: C 37.50%, H 2.52%, O 39.96%, S 20.02%
Literature References: Prepn from 4-chloro-5-hydroxy-2,7-naphthalenedisulfonic acid: DE 147852 (1904 to BASF); alternate methods: Frdl. 3, 460-466.
 
Derivative Type: Dihydrate
Properties: White needles, soluble in water.
 
Derivative Type: Disodium salt dihydrate
Molecular Formula: C10H6Na2O8S2.2H2O
Molecular Weight: 400.29
Percent Composition: C 30.00%, H 2.52%, Na 11.49%, O 39.97%, S 16.02%
Properties: White needles or leaflets. Very sol in water.
 
Use: Analytical reagent; intermediate for azo dyes.