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O-Toluidine

o-Toluidine
O-Toluidin.svg
Names
Preferred IUPAC name
2-Methylaniline
Other names
o-Methylaniline
o-Toluidine (no longer recommended)
1-Amino-2-methylbenzene
2-Aminotoluene
Identifiers
95-53-4 YesY
ChEBI CHEBI:66892 YesY
ChEMBL ChEMBL1381 YesY
ChemSpider 13854136 YesY
ECHA InfoCard 100.002.209
KEGG C14403 YesY
PubChem 17395403
UNII B635MZ0ZLU N
Properties
C7H9N
Molar mass 107.16 g·mol−1
Appearance Colorless to pale-yellow liquid
Odor Aromatic, aniline-like odor
Density 0.97759 g/cm3
Melting point −23.7 °C (−10.7 °F; 249.5 K)
Boiling point 200 to 202 °C (392 to 396 °F; 473 to 475 K)
0.19 g/100 ml at 20 °C
Vapor pressure 0.307531 mmHg (25 °C)
Hazards
Toxic T Oxidizing Agent O Dangerous for the Environment (Nature) N
NFPA 704
Flammability code 2: Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur. Flash point between 38 and 93 °C (100 and 200 °F). E.g., diesel fuel Health code 3: Short exposure could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Flash point 85 °C (185 °F; 358 K)
481.67 °C (899.01 °F; 754.82 K)
Lethal dose or concentration (LD, LC):
LD50 (median dose)
900 mg/kg (rat, oral)
3235 mg/kg (rabbit, oral)
Related compounds
Related compounds
Toluidine
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

o-Toluidine (ortho-toluidine) is an organic compound with the chemical formula C7H9N. This arylamine is a colorless to pale-yellow liquid with a poor solubility in water.

Through biological monitoring it was discovered that o-toluidine may be absorbed through inhalation and dermal contact. Extensive absorption (at least 92% of the administered oral dose) of o-toluidine from the gastrointestinal tract was observed. Studies show that the absorption of o-toluidine from the gastrointestinal tract in rats is rapid with peak values at 1 hour; the blood values were near zero in 24 hours. It is expected of aromatic amines, like o-toluidine, to be absorbable through the skin due to their lipid solubility. 48 hours following subcutaneous injection of labeled o-toluidine hydrochloride into rats, detected radioactivity in decreasing range: liver > kidney > spleen, colon > lung, bladder. In another study, 72 hours after oral application to rats, radioactivity was detected in decreasing range: blood > spleen > kidney > liver > subcutaneous abdominal fat > lung > heart > abdominal skin > bladder > gastrointestinal tract > bone marrow > brain > muscle > testes. The main excretion pathway is through the urine where up to one-third of the administered compound was recovered unchanged. Major metabolites were determined to be 4-amino-m-cresol and to a lesser extent, N-acetyl-4-amino-m-cresol, azoxytoluene, o-nitrosotoluene, N-acetyl-o-toluidine, N-acetyl-o-aminobenzyl alcohol, anthranilic acid, N-acetyl-anthranilic acid, 2-amino-m-cresol, p-hydroxy-o-toluidine and other unidentified substances. Conjugates that were formed were predominated by sulfate conjugates over glucuronide conjugates by a ratio of 6:1.


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