Dimethylamine

Title: Dimethylamine
CAS Registry Number: 124-40-3
CAS Name: N-Methylmethanamine
Molecular Formula: C2H7N
Molecular Weight: 45.08
Percent Composition: C 53.29%, H 15.65%, N 31.07%
Line Formula: (CH3)2NH
Literature References: Prepn from methanol + ammonia: Smith, US 2456599 (1948 to Commercial Solvents); Serban, Rev. Chim. (Bucharest) 14, 451 (1963), C.A. 60, 5097b (1964); by catalytic hydrogenation of nitrosodimethylamine: Livering, Maury, GB 797483 (1958 to Hercules Powder). Toxicity studies: R. Hazard et al., Arch. Int. Pharmacodyn. 112, 36 (1957); W. H. Steinhagen et al., Am. Ind. Hyg. Assoc. J. 43, 411 (1982).
Properties: A gas at ordinary temp; characteristic odor. d40 (liq) 0.680. bp 7°, mp -96°. Very sol in water forming a very strong alkaline soln; sol in alcohol or ether. Has been marketed in compressed liq form in tubes or as a 33% aq soln.
Melting point: mp -96°
Boiling point: bp 7°
Density: d40 (liq) 0.680
Derivative Type: Hydrochloride
CAS Registry Number: 506-59-2
Molecular Formula: C2H7N.HCl
Molecular Weight: 81.54
Percent Composition: C 29.46%, H 9.89%, N 17.18%, Cl 43.48%
Properties: Deliquesc leaflets, mp 171°. Very sol in water; sol in alcohol, chloroform. Practically insol in ether. Keep well closed. LD50 in mice (g/kg): 1.21 i.v., 2.00 s.c. (Hazard). LC50 in mice (ppm): 7650 (48 hr), 4725 (14 day); in rats (ppm): 4540 (6 hr) (Steinhagen).
Melting point: mp 171°
Toxicity data: LD50 in mice (g/kg): 1.21 i.v., 2.00 s.c. (Hazard); LC50 in mice (ppm): 7650 (48 hr), 4725 (14 day); in rats (ppm): 4540 (6 hr) (Steinhagen)
CAUTION: Potential symptoms of overexposure are irritation of nose and throat; sneezing, coughing and dyspnea; pulmonary edema; conjunctivitis; dermatitis; direct contact with liquid may cause frostbite. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 110.
Use: As accelerator in vulcanizing rubber, tanning, manuf detergent soaps, or attracting boll weevils to exterminate them. As reagent for Mg.
Dimethylcadmium Dimethylmercury Dimethylolpropionic Acid Dimethyl-p-phenylenediamine Dimethylthiambutene

Dimethylamine
Skeletal formula of dimethylamine
Ball and stick model of dimethylamine
Identifiers
CAS number 124-40-3 YesY
PubChem 674
ChemSpider 654 YesY
UNII ARQ8157E0Q YesY
EC number 204-697-4
UN number 1032
KEGG C00543 YesY
MeSH dimethylamine
ChEBI CHEBI:17170 YesY
ChEMBL CHEMBL120433 YesY
RTECS number IP8750000
Beilstein Reference 605257
Gmelin Reference 849
3DMet B00125
Jmol-3D images Image 1
Properties[3][4]
Molecular formula (CH3)2NH
Appearance Colorless gas
Odor Ichtyal, ammoniacal
Melting point −93.00 °C; −135.40 °F; 180.15 K
Boiling point 7 to 9 °C; 44 to 48 °F; 280 to 282 K
Solubility in water 3.540 kg L−1
log P −0.362
Vapor pressure 170.3 kPa (at 20 °C)
kH 310 μmol Pa−1 kg−1
Acidity (pKa) 10.64[2]
Basicity (pKb) 3.29
Thermochemistry
Std enthalpy of
formation ΔfHo298
−21–−17 kJ mol−1
Hazards
GHS pictograms The flame pictogram in the Globally Harmonized System of Classification and Labelling of Chemicals (GHS) The corrosion pictogram in the Globally Harmonized System of Classification and Labelling of Chemicals (GHS) The exclamation-mark pictogram in the Globally Harmonized System of Classification and Labelling of Chemicals (GHS)
GHS signal word DANGER
GHS hazard statements H220, H302, H315, H318, H332, H335
GHS precautionary statements P210, P261, P280, P305+351+338
EU Index 612-001-00-9
EU classification Flammable F+ Harmful Xn
R-phrases R12, R20, R37/38, R41
S-phrases (S2), S16, S26, S39
NFPA 704
NFPA 704.svg
4
3
0
Flash point −6 °C; 21 °F; 267 K
Autoignition temperature 401 °C; 754 °F; 674 K
Explosive limits 2.8–14.4%
Related compounds
Related amines
  • Trimethylamine
  • Diethylamine
  • Triethylamine
  • Diisopropylamine
  • Dimethylaminopropylamine
  • Triisopropylamine
Related compounds
  • Unsymmetrical dimethylhydrazine
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Dimethylamine is an organic compound with the formula (CH3)2NH. This secondary amine is a colorless, flammable gas with an ammonia-like odor. Dimethylamine is commonly encountered commercially as a solution in water at concentrations up to around 40%. In 2005, an estimated 270,000 tons were produced industrially,[5] but it is also found as a natural product.