Methylamine

Names Pronunciation
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() Preferred IUPAC nameOther names Identifiers Abbreviations MMA
MeNH₂741851 ChEBIChEMBLChemSpiderDrugBankECHA InfoCard100.000.746EC Number145 KEGGMeSHmethylamineRTECS numberUNIIUN number1061 Properties CH₅NMolar mass31.058 g·mol Appearance Colorless gas OdorFishy, ammoniacal Density0.6562 g/cm (at 25 °C) Melting point−93.10 °C; −135.58 °F; 180.05 K Boiling point−6.6 to −6.0 °C; 20.0 to 21.1 °F; 266.5 to 267.1 K 1008 g/L (at 20 °C) log P−0.472 Vapor pressure186.10 kPa (at 20 °C) 1.4 mmol/(Pa·kg) Acidity (pK_a) 10.66 Conjugate acid[CH₃NH₃] (Methylammonium) −27.0·10 cm/mol Viscosity230 μPa·s (at 0 °C) 1.31 D Thermochemistry −23.5 kJ/mol Hazards GHS labelling: DangerH220, H315, H318, H332, H335P210, P261, P280, P305+P351+P338, P410+P403NFPA 704 (fire diamond) Flash point−10 °C; 14 °F; 263 K (liquid, gas is extremely flammable) 430 °C (806 °F; 703 K) Explosive limits4.9–20.7% Lethal dose or concentration (LD, LC): 100 mg/kg (oral, rat) 1860 ppm (mouse, 2 hr) NIOSH (US health exposure limits): TWA 10 ppm (12 mg/m) TWA 10 ppm (12 mg/m) 100 ppm Safety data sheet (SDS) emdchemicals.comRelated compounds ethylamine, dimethylamine, trimethylamineammonia

Methylamine, also known as methanamine, is an organic compound with a formula of CH₅N or CH₃NH₂. This colorless gas is a derivative of ammonia, but with one hydrogen atom being replaced by a methyl group. It is the simplest primary amine.

Methylamine is sold dissolved in solution with methanol, ethanol, tetrahydrofuran, or water, or as the anhydrous gas in pressurized metal containers. Industrially, methylamine is transported in its anhydrous form in pressurized railcars and tank trailers. It has a strong odor similar to rotten fish. Methylamine is used as a building block for the synthesis of numerous other commercially available compounds.