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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



any of three amino derivatives of toluene.

Ortho, meta, and para isomers of toluidines are known (see Table 1). Toluidines are readily soluble in organic solvents but poorly soluble in water; they may be steam-distilled, and they darken (oxidize) upon storage in light in the presence of air.

Toluidines are obtained industrially by the reduction of nitro-toluenes using iron and hydrochloric acid. They are similar to aniline in their chemical properties. They form salts with acids and

Table 1. Selected properties of toluidines
 Melting point (°C)Boiling point (°C)Density at 20°C (g/cm3)
Ortho-toluidine(1,2-). . . . . . . . . .–24,4 (unstable)200.30.9984
Ortho-toluidine (1,6-). . . . . . . . . .–16.25 (stable)200.30.9984
Mete-toluidine(1,3-or 1,5-). . . . . . . . . .–30.4203.40.9891
Para-toluidine (1,4-). . . . . . . . . .44.5–45,0200.551.046

undergo diazotization, acylation, halogenation, sulfonation, and alkylation. Toluidines are used in the manufacture of various dyes.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Hematoksilen-Eozin (HE) ve Toluidin Blue (TB) islemlerine ek olarak Mast-hucre triptaz boyamasi icin kullanima hazir olan 4-[micro]m kalinligindaki yapiskanli cam slaytlarin (MicroSlides Snowcoat X-tra; Surgiparh, Richmond, IL, USA) uzerine yerlestirildi.
Toluidin blue: The histological examination of the all tissue constructs with toluidine blue revealed that they contained a cartilage-like matrix that accumulated within the lumen of clusters of round cells.
Hazirlanan doku bloklarindan Leica RM 2125 RT mikrotomla 5 m'lik kesitler alinarak hematoksilen eozin, toluidin mavisi ve mallory azan boyalari yapildi.
Sections of 1[micro]m were stained with 1% toluidin blue and observed under a high resolution light microscope.