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[¦par·ə ə‚mē·nō′fē·nȯl]
(organic chemistry)
p-HOC6H4NO2 A phenol in which an amino (‒NH2) group is located on the benzene ring of carbon atoms para (p) to the hydroxyl (‒OH) group; used as a photographic developer and as an intermediate in dye manufacture.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the Para isomer of aminophenol. White crystals, melting point 186°C. The structure of Para-aminophenol is

At 0°C, 1g of Para-aminophenol dissolves in 90 g of water or 22 g of alcohol; the compound is readily soluble in hot water and alcohol and insoluble in benzene and chloroform, Para-amino-phenol is a strong reducing agent and oxidizes quickly upon exposure to atmospheric oxygen, especially in alkaline solutions. It reacts with acids and bases to form salts.

Para-aminophenol, a photographic developer, is obtained by reducing Para-nitrophenol or nitrobenzene. Developers are a widely used class of compounds, although they are known to produce slight photographic fogging. Para-aminophenol is used in the synthesis of many organic dyes and was first synthesized by the German chemists A. Baeyer and H. Caro in 1874.

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