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CAS No 2103-64-2 , 3',4',5',6'-tetrahydroxyspiro[2-benzofuran-3,9'-xanthene]-1-one Search by region : Germany

  • Name: 3',4',5',6'-tetrahydroxyspiro[2-benzofuran-3,9'-xanthene]-1-one
  • Synonyms: Pyrogallolphthalein; C.I. Mordant Violet 25;Alizarin violet; C.I. 45445; NSC8668; 4,5-Dihydroxyfluorescein; 2103-64-2;3',4',5',6'-tetrahydroxyspiro[2-benzofuran-3,9'-xanthene]-1-one; Mordant violet 25;
  • CAS Registry Number:
  • Flash Point: 255.2°C
  • Boiling Point: 687.4°Cat760mmHg
  • Density: 1.81g/cm3
  • Refractive index: 1.865
  • Flash Point: 255.2°C
  • EINECS: 218-272-6
  • Molecular Weight: 364.30508
  • InchiKey: PHLYOKFVXIVOJC-UHFFFAOYSA-N
  • InChI: InChI=1S/C20H12O7/c21-13-7-5-11-17(15(13)23)26-18-12(6-8-14(22)16(18)24)
    20(11)10-4-2-1-3-9(10)19(25)27-20/h1-8,21-24H
  • Molecular Formula: C20H12O7
  • Molecular Structure:CAS No:2103-64-2 3',4',5',6'-tetrahydroxyspiro[2-benzofuran-3,9'-xanthene]-1-one

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2103-64-2 GALLEIN

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References of 3',4',5',6'-tetrahydroxyspiro[2-benzofuran-3,9'-xanthene]-1-one
Title: Gallein
CAS Registry Number: 2103-64-2
CAS Name: 3￠,4￠,5￠,6￠-Tetrahydroxyspiro[isobenzofuran-1(3H),9￠-[9H]xanthen]-3-one
Synonyms: 3￠,4￠,5￠,6￠-tetrahydroxyfluoran; 3￠,4￠,5￠,6￠-tetrahydroxyspiro[phthalan-1,9￠-xanthen]-3-one; pyrogallolphthalein; C.I. 45445; mordant violet 25
Molecular Formula: C20H12O7
Molecular Weight: 364.31
Percent Composition: C 65.94%, H 3.32%, O 30.74%
Literature References: Obtained by heating 1 part phthalic anhydride with 2 parts of pyrogallol or gallic acid: Baeyer, Ber. 4, 457 (1871); Buchka, Ann. 209, 261 (1881). Use as a biological stain: R. D. Lillie et al., Stain Technol. 49, 339 (1974); R. Welsh, ibid. 52, 261 (1977). See also H. J. Conn's Biological Stains, R. D. Lillie, Ed. (Williams & Wilkins, Baltimore, 9th ed., 1977) p 351.
Properties: Brownish-red powder or crystals with 1? H2O, or red crystals with greenish-yellow color when anhydr. Loses the water of crystn at about 180° and blackens above this temp. Does not melt even at 300°. pH 3.8 brownish-yellow; pH 6.6 rose-red. Almost insol in water, benzene, chloroform. Slightly sol in ether; sol in alc, acetone, alkalies.
 
Derivative Type: Disodium salt
Synonyms: Alizarin violet
Molecular Formula: C20H10Na2O7
Molecular Weight: 408.27
Percent Composition: C 58.84%, H 2.47%, Na 11.26%, O 27.43%
Properties: pH 10.6 rose; pH 13.0 violet.
 
Use: Clinical reagent (phosphates in urine). Monophosphates give a yellow, dibasic a red, tribasic a violet color. Used in soln of 0.5 g in 100 ml 50% alc; 2-3 drops for 100 ml liq. As sensitive indicator for acids, alkali hydroxides, NH3, but not for carbonates. Biological stain.