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(pī'rōgăl`ōl) or

pyrogallic acid

(–ĭk), C6H6O3, white, crystalline, aromatic compound with a biting taste; it is poisonous. It melts at 133°C; and boils at 309°C;. In alkaline solution it is an active reducing agent. Pyrogallol is widely used in photographic developing and in the manufacture of some dyes. Chemically it is a phenol; its IUPAC name is 1,2,3-trihydroxybenzene.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(1,2,3-trihydroxybenzene), a trihydric phenol; a colorless, odorless crystalline solid. Melting point, 133°–134°C; boiling point, 309°C. It darkens rapidly upon exposure to air, sublimes readily, and is soluble in water, alcohol, and ether.

Pyrogallol is produced commercially by dry distillation (decarboxylation) of gallic acid and tannins (derivatives of gallic

acid). The rapid and quantitative absorption of oxygen by pyro-gallol is used in analytical chemistry, including gas analysis, and in laboratory practice. Pyrogallol is also used as a photographic developer. It is a source material in the synthesis of certain dyes.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


(organic chemistry)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The wall of CNTs had strong interactions with the aromatic ring of pyrogallol, which led to the adsorption of pyrogallol.
A ratio of 1:1 hexane: DEE extracted pyrogallol, acetosyringone and most of the syringaldehyde.
However, if there is a possibility for [Cs.sup.+] to interact simultaneously with several hydroxyl groups (as in catechol, pyrogallol) by forming chelate-type complexes, the affinity is obviously higher and comparable to the molecules with carboxyl groups present.
However in the case of the 1:1 adduct of 1,2,3-trihydroxybenzene (pyrogallol, VII) and HMTA (shown in Scheme 2), investigation of the crystal structure has been carried out using powder diffraction data obtained from a conventional laboratory-based diffractometer [6].
Pyrogallol, an analog of propyl-gallate, has been used for an adsorptive stripping measurement of germanium (IV) (8).
The catechol, resorcinol, pyrogallol and phloroglucinol were of laboratory grade.
Frost claims that by producing important intermediates like catechol, adipic acid, hydroquinone, benzoquinone, gallic acid, and pyrogallol - all of which are currently made using cancer-causing benzene - his clean processes can reduce benzene use by 20%.
Pyrogallol is used in biodiesel as it acts as an anti-oxidizing agent.
A reaction mixture prepared by adding 1.3 mL of Tris-HCl buffer (50 mM Tris, 10 mM EDTA, pH 8.5) and 100 [micro]L of 7.2 mM pyrogallol was added to an aliquot (100 [micro]L) of sample extracted and reacted at 25[degrees]C for 10 min.
Folin-Ciocalteu's phenol reagent, fluorescein sodium, 2,2,-azobis(2-amidinopropane)dihydrochloride (AAPH), 2,5-dinitrosalicylic acid (DNS), trolox, ethylenediaminetetraacetic acid (EDTA), pyrogallol, quercetin, and gallic acid were supplied by Sigma-Aldrich LLC (St.