pyrogallol


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Related to pyrogallol: purpurogallin

pyrogallol

(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.

Pyrogallol

 

(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.

pyrogallol

[‚pī·rō′ga‚lȯl]
(organic chemistry)
References in periodicals archive ?
During curing process, pyrogallol-functionalized CNTs reacted with the epoxy through the mediation reaction of pyrogallol with anhydride.
This value is low enough to suggest that, when R = methyl, the substituent and the pyrogallol ring can freely rotate around that bond and readily reorient from their initial positions with respect to the bond as the compound is assembled.
Involvement of superoxide anion radical in the auto-oxidation of pyrogallol and a convenient assay for superoxide dismutase.
These collected particles were highly oxidizing and generated large amounts of free radicals as detected by EPR, exceeding the signal seen with both the standard reference NIST urban dust material at an equivalent concentration and the intense free-radical generating oxidant pyrogallol (Figure 2).
05 mg total anthocyanins per liter showed the greatest protection against loss of A23187 relaxation following exposure to ROS from pyrogallol (Ck, % maximal relaxation and -logED50 to A23187, respectively, means +/- SE: Ck alone, 93 +/- 5%, 7.
Pyrogallol, syringaldehyde and acetosyringone stayed in the still but were mainly lost.
This type of complex formation is favoured when there are electronegative atoms of functional groups substituted in adjacent positions in the aromatic ring (like in o-phthalic acid, pyrogallol, catechol, maleic acid, etc.
The structural model used in the Monte Carlo structure solution comprised a complete HMTA molecule and a pyrogallol molecule excluding the hydrogen atoms on the three hydroxyl groups.
The total protein content of each beer before and after filtration was measured using the Pyrogallol Red Molybdate (PRM) method of assay.
Pyrogallol, an analog of propyl-gallate, has been used for an adsorptive stripping measurement of germanium (IV) (8).
Thus, flavonoids that have Brings derived from catechol or pyrogallol (two and three adjacent hydroxyls, respectively) are potentially most active.
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%.