o-Anisidine Chemical Properties

Melting point:

3-6 °C(lit.)

Boiling point:

225 °C(lit.)

Density 

1.092 g/mL at 25 °C(lit.)

vapor pressure 

<0.1 at 25 °C (NIOSH, 1994)

refractive index 

n20/D 1.574(lit.)

Flash point:

210 °F

storage temp. 

Refrigerator

solubility 

14g/l

form 

Powder/Solid

pka

4.52(at 25℃)

color 

Off-white

PH

7.3 (1g/l, H2O, 20℃)

Water Solubility 

13 g/L (20 ºC)

Sensitive 

Light Sensitive

Merck 

14,667

BRN 

386210

Henry's Law Constant

1.25 at 25 °C (approximate - calculated from water solubility and vapor pressure)

Dielectric constant

5.2300000000000004

Exposure limits

Potential occupational carcinogen. NIOSH REL: TWA 0.5 mg/m³, IDLH 50 mg/m³; OSHA PEL: TWA 0.5 mg/m³; ACGIH TLV: TWA 0.1 ppm (adopted).

Stability:

Stable. Incompatible with strong oxidizing agents, acid anhydrides, chloroformates, acids, some plastics, rubber. Air sensitive.

InChIKey

VMPITZXILSNTON-UHFFFAOYSA-N

LogP

1.180

CAS DataBase Reference

90-04-0(CAS DataBase Reference)

NIST Chemistry Reference

Benzenamine, 2-methoxy-(90-04-0)

IARC

2A (Vol. Sup 7, 73, 127)

EPA Substance Registry System

o-Anisidine (90-04-0)

Safety Information

Hazard Codes 

T,Xi

Risk Statements 

45-23/24/25-68

Safety Statements 

53-45

OEB

C

OEL

TWA: 0.5 mg/m3 [skin]

RIDADR 

UN 2431 6.1/PG 3

WGK Germany 

3

RTECS 

BZ5410000

F 

8

TSCA 

Yes

HazardClass 

6.1

PackingGroup 

III

HS Code 

29222200

Hazardous Substances Data

90-04-0(Hazardous Substances Data)

Toxicity

Acute oral LD₅₀ for rats 2,000 mg/kg, wild birds 422 mg/kg, mice 1,400 mg/kg, rabbits 870 mg/kg (quoted, RTECS, 1985).

IDLA

50 mg/m3

MSDS

• Language:English Provider:o-Anisidine
• Language:English Provider:ACROS
• Language:English Provider:SigmaAldrich
• Language:English Provider:ALFA

o-Anisidine Usage And Synthesis

Description

o-Anisidine was produced commercially in the United States from the 1920s until late 1950s. By 2009, worldwide only six industries manufactured o-anisidine, but none produced hydrochloride salt. o-Anisidine was available from 44 suppliers, including 20 US suppliers, and the hydrochloride salt was available from eight suppliers, including five US suppliers. US imports of o-anisidine and its hydrochloride salt are reported in the category ‘o-anisidines, p-anisidines, and p-phenetidine,’ and US exports are reported in the category ‘anisidines, dianisidines, phenetidines, and their salts.’ From 1989 to 2008, imports ranged from a high of over 4.6 million kg in 1996 to zero in 2007 and 2008, and exports ranged from zero to 262 000 kg. Reports filed under the US Environmental Protection Agency’s (EPA) Toxic Substances Control Act Inventory Up Rule indicated that United States production plus imports of o-anisidine totaled 500 000 lb–1 million lb in 1986, 1990, and 2006; 1 million–10 million lb in 1990 and 1998; and 10 000–500 000 lb in 2002.

Chemical Properties

Anisidine exists as ortho-, meta-, and paraisomers. They have characteristic amine (fishy) odors.
o-Anisidine (or o-methoxyaniline) is an aromatic amine with a methoxyl group ortho to the amino group of aniline. It is a colorless to yellowish, pink, or reddish liquid.o-Anisidine is soluble in water and mineral oils, and miscible with alcohol, benzene, acetone, and diethylether. o-Anisidine hydrochloride, a salt of o-anisidine, is a grayish crystalline solid or powder at room temperature and is soluble in water (NTP, 2011).

Physical properties

Colorless, yellow to reddish liquid with an amine-like odor. Becomes brown on exposure to air.

Uses

In the preparation of azo dyes; corrosion inhibitor; chemical intermediate

Uses

It is primarily used as a chemical intermediate in the production of pigments, dyes, pharmaceuticals, and fragrances. o-Anisidine hydrochloride is used as a chemical intermediate in the production of numerous azo and triphenylmethane dyes and pigments (e.g., C.I. direct red 72, disperse orange 29, direct yellow 44, direct red 24, and acid red 4); in the production of pharmaceuticals, including the expectorant guaiacol; as a corrosion inhibitor for steel; and as an antioxidant for polymercaptan resins.

Uses

Similar to other aromatic amines, o-anisidine may cause methemglobinemia and cancer in humans. It is used mainly as an intermediate for the production of azo dyes and pigments. Other industrial uses of o-anisidine include synthesis of other dyes and pharmaceuticals, as a corrosion inhibitor for steel, and as an antioxidant for polymercaptan resins (IARC, 1999; HSDB, 2012).
Intermediate for azo dyes and for guaiacol.

Definition

ChEBI: O-anisidine is a substituted aniline that is aniline in which the hydrogen ortho to the amino group has been replaced by a methoxy group. It is used as a chemical intermediate in the synthesis of azo pigments and dyes. It has a role as a reagent and a genotoxin. It is a monomethoxybenzene, a substituted aniline and a primary amino compound.

Synthesis Reference(s)

Tetrahedron Letters, 24, p. 4733, 1983 DOI: 10.1016/S0040-4039(00)86242-5

General Description

Clear, yellowish to reddish or brown liquid with an amine (fishy) odor.

Air & Water Reactions

o-Anisidine darkens on exposure to air. Insoluble in water.

Reactivity Profile

o-Anisidine is sensitive to heat. o-Anisidine is also sensitive to exposure to light. o-Anisidine is incompatible with strong oxidizers. o-Anisidine is also incompatible with acids, acid chlorides, acid anhydrides and chloroformates. o-Anisidine will attack some forms of plastics, rubber and coatings. .

Hazard

Strong irritant. Toxic when absorbed through the skin. Possible carcinogen.

Health Hazard

o-Anisidine was carcinogenic in experimental animals.

Fire Hazard

o-Anisidine is combustible.

Safety Profile

Confirmed carcinogen. Moderately toxic by ingestion. Mutation data reported. When heated to decomposition it emits toxic fumes of NOx.

Potential Exposure

Anisidines are used in the manufacture of azo dyes; pharmaceuticals; textile-processing chemicals Incompatibilities: Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine,bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides. Attacks some coatings and some forms of plastic and rubber.

Carcinogenicity

o-Anisidine is reasonably anticipated to be a human carcinogen based on sufficient evidence of carcinogenicity in experimental animals.

Environmental Fate

Biological. o-Anisidine should be biodegradable according to OECD guidelines (Brown and Labouerer (1983). Chemical/Physical. At influent concentrations (pH 3.0) of 10, 1.0, 0.1, and 0.01 mg/L, the GAC adsorption capacities were 52, 20, 7.8, and 3.0 mg/g, respectively. At pHs 7 and 9, the GAC adsorption capacities were 110, 50, 23, and 10 mg/g at influent concentrations of 10, 1.0, 0.1, and 0.01 mg/L, respectively (Dobbs and Cohen, 1980).

Shipping

UN2431 Anisidines, Hazard Class: 6.1; Labels: 6.1-Poisonous materials

Purification Methods

It is separated from the m-and p-isomers by steam distillation. It is also separated from its usual synthetic precursor o-nitroanisole by dissolving it in dilute HCl (pH <2.0) extracting the nitro impurity with Et2O, adjusting the pH to ~8.0 with NaOH, extracting the amine into Et2O or steam distilling. Extract the distillate with Et2O, dry the extract (Na2SO4), filter, evaporate and fractionate the residual oil. Protect the almost colourless oil from light which turns it yellow in color. [Biggs & Robinson J Chem Soc 3881961, Nodzu et al. Yakugaku Zasshi (J Pharm Soc Japan) 71 713, 715 1951, Beilstein 13 IV 806.]

Toxicity evaluation

It is primarily metabolized by cytochrome P450 isozymes, and it forms two o-anisidine–DNA adducts with DNA. It causes DNA damage by a metabolite in the presence of metals such as Cu(II). It can also cause Cu(II)-mediated oxidative DNA damage.

Waste Disposal

Dissolve in combustible solvent (alcohols, benzene, etc.) and spray solution into furnace equipped with afterburner and scrubber, or burn spill residue on sand and soda ash absorbent in a furnace.

o-Anisidine(90-04-0)Related Product Information

• Methyl anthranilate
• o-Toluidine
• ALTRENOGEST
• Guaiacol
• 2-Aminobenzyl alcohol
• 2-Chloroaniline
• 2-(Trifluoromethoxy)aniline
• 2,4-DIAMINOANISOLE
• 4-Aminoveratrole
• 4-(Trifluoromethoxy)aniline
• 2-Aminobenzaldehyde
• Betaine
• 3-Ethoxyaniline
• Aniline-2-sulfonic acid
• o-Anisaldehyde
• Glycine
• m-Anisidine
• p-Anisidine