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Dimethylamine

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Name Dimethylamine EINECS 204-697-4
CAS No. 124-40-3 Density 0.68 g/cm3
Solubility miscible with water Melting Point -93 °C
Formula C2H7N Boiling Point 6.1 °C at 760 mmHg
Molecular Weight 45.08 Flash Point
Transport Information UN 2924 3/PG 2 Appearance colourless compressed liquefied gas
Safety 3-16-26-29-36/37/39-45 Risk Codes 12-20-37/38-41-34-20/22-11-39/23/24/25
Molecular Structure Molecular Structure of 124-40-3 (Dimethylamine) Hazard Symbols FlammableF,HarmfulXn
Synonyms

N,N-Dimethylamine;N-Methylmethanamine;NSC 8650;

 

Chemistry

IUPAC Name: N-Methylmethanamine
Synonyms of Dimethylamine (CAS NO.124-40-3): Dimethylamine (anhydrous) ; Methanamine, N-methyl- ; N,N-Dimethylamine ; N-Methylmethanamine ; Dimethylamine, in aqueous solution
CAS NO: 124-40-3
Molecular Formula: C2H7N
Molecular Weight: 45.08
Molecular Structure:
EINECS: 204-697-4 
H bond acceptors: 1
H bond donors: 1
Freely Rotating Bonds: 0
Polar Surface Area: 3.24 Å2
Vapor density: 1.55 (vs air)
Vapor pressure: 16.97 psi ( 55 °C)
Refractive index:  n20/D 1.37
Density: 0.654
Melting Point: -93°C
Boiling Point: 7°C
Flash Point: 60 °F
Solubility: Miscible
Appearance: colourless compressed liquefied gas
Storage temp: Flammables area
Sensitive: Hygroscopic 
Stability: Stable. Generally used as a solution in water at concentrations up to around 40%. Extremely flammable in the pure form. Incompatible with strong oxidizing agents. 
Product Categories of Dimethylamine (CAS NO.124-40-3): Pharmaceutical Intermediates;Compressed and Liquefied GasesChemical Synthesis;Chemical Synthesis;Compressed and Liquefied Gases;C2 to C6Chemical Synthesis;Amines;Nitrogen Compounds;Organic Bases;Synthetic Reagents

Uses

 Dimethylamine (CAS NO.124-40-3) is a precursor to several industrially significant compounds. It is also raw material for dimefox and diphenhydramine.

Production

 Dimethylamine (CAS NO.124-40-3) is manufactured by the reaction of methanol with ammonla.
      2CH3OH + NH3 → (CH3)2NH + 2H2O

Toxicity Data With Reference

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
guinea pig LD50 oral 240mg/kg (240mg/kg) BEHAVIORAL: EXCITEMENT

BEHAVIORAL: MUSCLE WEAKNESS

GASTROINTESTINAL: ULCERATION OR BLEEDING FROM STOMACH
Hygiene and Sanitation Vol. 32(6), Pg. 329, 1967.
mammal (species unspecified) LC50 inhalation 3700mg/m3 (3700mg/m3)   Toksikologiya Novykh Promyshlennykh Khimicheskikh Veshchestv. Toxicology of New Industrial Chemical Substances. For English translation, see TNICS*. Vol. 14, Pg. 80, 1975.
mouse LC50 inhalation 4725ppm/2H (4725ppm)   American Industrial Hygiene Association Journal. Vol. 43, Pg. 411, 1982.
mouse LD50 intraperitoneal 736mg/kg (736mg/kg)   Yakugaku Zasshi. Journal of Pharmacy. Vol. 97, Pg. 1117, 1977.
mouse LD50 oral 316mg/kg (316mg/kg) BEHAVIORAL: EXCITEMENT

BEHAVIORAL: MUSCLE WEAKNESS

GASTROINTESTINAL: ULCERATION OR BLEEDING FROM STOMACH
Hygiene and Sanitation Vol. 32(6), Pg. 329, 1967.
rabbit LD50 oral 240mg/kg (240mg/kg) BEHAVIORAL: EXCITEMENT

BEHAVIORAL: MUSCLE WEAKNESS

GASTROINTESTINAL: ULCERATION OR BLEEDING FROM STOMACH
Hygiene and Sanitation Vol. 32(6), Pg. 329, 1967.
rabbit LDLo intravenous 4gm/kg (4000mg/kg)   "Merck Index; an Encyclopedia of Chemicals, Drugs, and Biologicals", 11th ed., Rahway, NJ 07065, Merck & Co., Inc. 1989Vol. 11, Pg. 509, 1989.
rat LC50 inhalation 4540ppm/6H (4540ppm) SENSE ORGANS AND SPECIAL SENSES: OTHER CHANGES: OLFACTION

SENSE ORGANS AND SPECIAL SENSES: OTHER: EYE

LUNGS, THORAX, OR RESPIRATION: DYSPNEA
American Industrial Hygiene Association Journal. Vol. 43, Pg. 411, 1982.
rat LD50 oral 698mg/kg (698mg/kg) BEHAVIORAL: EXCITEMENT

BEHAVIORAL: MUSCLE WEAKNESS

GASTROINTESTINAL: ULCERATION OR BLEEDING FROM STOMACH
Hygiene and Sanitation Vol. 32(6), Pg. 329, 1967.

Consensus Reports

EPA Genetic Toxicology Program. Reported in EPA TSCA Inventory.

Safety Profile

Safety Information of Dimethylamine (CAS NO.124-40-3):
Hazard Codes: F+,FXnCT
Risk Statements: 12-20-37/38-41-34-20/22-11-39/23/24/25
12: Extremely Flammable 
20: Harmful by inhalation 
37/38: Irritating to respiratory system and skin 
41: Risk of serious damage to eyes 
34: Causes burns 
20/22: Harmful by inhalation and if swallowed 
11: Highly Flammable 
39/23/24/25: Toxic: danger of very serious irreversible effects through inhalation, in contact with skin and if swallowed 
Safety Statements: 3-16-26-29-36/37/39-45
3: Keep in a cool place 
16: Keep away from sources of ignition - No smoking 
26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice 
29: Do not empty into drains 
36/37/39: Wear suitable protective clothing, gloves and eye/face protection 
45: In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) 
RIDADR: UN 2924 3/PG 2
WGK Germany: 2
F: 3
HazardClass: 3
PackingGroup: II
Poison by ingestion. Moderately toxic by inhalation and intravenous routes. Mutation data reported. An eye irritant. Corrosive to the eyes, skin, and mucous membranes. A flammable gas. When heated to decomposition it emits toxic fumes of NOx. Incompatible with acrylaldehyde, fluorine, and maleic anhydride

Standards and Recommendations

OSHA PEL: TWA 10 ppm
ACGIH TLV: TWA 5 ppm; STEL 15 ppm; Not Classifiable as a Human Carcinogen
DFG MAK: 2 ppm (3.7 mg/m3)
DOT Classification:  2.1; Label: Flammable Gas (UN 1032); DOT Class: 3; Label: Flammable Liquid (UN 1160)

Specification

 Dimethylamine is a base, neutralizing acids in exothermic reactions, and a reducing agent. Dimethylamine is temperature sensitive. It reacts vigorously with mercury and chlorine. Besides, it also reacts violently with strong oxidizing agents and attacks copper and copper compounds. It still reacts with hypochlorites to give N-chloroamines, some of which are explosives when isolated.

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