pyrogallol


pyrogallol
pyrogallic /puy'reuh gal"ik, -gaw"lik/, adj.
/puy'reuh gal"awl, -ol, -geuh lawl", -lol"/, n.
a white, crystalline, water-soluble, poisonous, solid, phenolic compound, C6H3(OH)3, obtained by heating gallic acid and water: used chiefly as a developer in photography, as a mordant for wool, in dyeing, and in medicine in the treatment of certain skin conditions. Also called pyrogallic acid.
[1875-80; PYRO- + GALL(IC)2 + -OL1]

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also called  pyrogallic acid , or  1,2,3-trihydroxybenzene 

      an organic compound belonging to the phenol family, used as a photographic film developer and in the preparation of other chemicals.

      Pyrogallol was first obtained in 1786 from gallic acid, obtainable from galls and barks of various trees. It is converted to pyrogallol by heating with water under pressure. Pyrogallol is the oldest photographic developer, its rapid deposition of silver from silver salts having first been noted in 1832. Alkaline solutions of pyrogallol absorb oxygen efficiently and are used in determining the oxygen content of gas mixtures.

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Universalium. 2010.

Look at other dictionaries:

  • Pyrogallol — structure du pyrogallol Général Nom IUPAC 1,2,3 Trihydroxybenzène …   Wikipédia en Français

  • PYROGALLOL — Trihydroxy 1,2,3 benzène, improprement dit acide pyrogallique. Formule brute: C6H3(OH)3 Masse moléculaire: 126,11 g Masse spécifique: 1,453 g/cm3 Point de fusion: 131 133 0C Point d’ébullition: 309 0C Composé inodore, cristallisant en aiguilles… …   Encyclopédie Universelle

  • Pyrogallol — Pyr o*gal lol, n. [Pyrogallic + ol.] (Chem.) A phenol metameric with phloroglucin, obtained by the distillation of gallic acid as a poisonous white crystalline substance having acid properties, and hence called also {pyrogallic acid}. It is a… …   The Collaborative International Dictionary of English

  • Pyrogallol — Pyrogallōl, Pyrogallussäure, Brenzgallussäure, ein Trioxybenzol, entsteht aus Gallussäure durch Erhitzen auf 210°, farblose, glänzende Kristalle von bitterm Geschmack, giftig, reduziert Edelmetalle aus ihren Salzen, oxydiert sich, bes. in… …   Kleines Konversations-Lexikon

  • pyrogallol — [pī΄rə gal′ôl΄, pī΄rə gal′ōl΄] n. [ PYRO + GALL(IC ACID) + OL1] a poisonous, white, crystalline phenol, C6H3 (OH) 3, produced by heating gallic acid: used in medicine, as a developer in photography, etc …   English World dictionary

  • Pyrogallol — Strukturformel Allgemeines Name Pyrogallol Andere Namen …   Deutsch Wikipedia

  • Pyrogallol — Chembox new Name = Pyrogallol ImageFile = pyrogallol.svg ImageName = Pyrogallol OtherNames = 1,2,3 Trihydroxybenzene Pyrogallic acid Section1 = Chembox Identifiers CASNo = 87 66 1 SMILES = OC1=C(O)C=CC=C1O Section2 = Chembox Properties Formula =… …   Wikipedia

  • Pyrogallol — Py|ro|gal|lol 〈n.; s; unz.〉 = Pyrogallussäure * * * Py|ro|gal|lol [↑ pyro (1), ↑ Gallussäure (liefert P. beim Erhitzen) u. ↑ ol (1)], das; s; Syn.: (systematisch:) Benzol 1,2,3 triol, ( …   Universal-Lexikon

  • pyrogallol — pirogalolis statusas T sritis chemija formulė C₆H₃(OH)₃ atitikmenys: angl. pyrogallic acid; pyrogallol rus. пирогалловая кислота; пирогаллол ryšiai: sinonimas – 1,2,3 benzentriolis …   Chemijos terminų aiškinamasis žodynas

  • pyrogallol — noun Etymology: International Scientific Vocabulary pyro + gallic (acid) + 1 ol Date: 1869 a poisonous bitter crystalline phenol C6H6O3 with weak acid properties that is usually obtained by pyrolysis of gallic acid and used especially as a mild… …   New Collegiate Dictionary


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