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|Section2=〕 | Formula = (CH3)2NH | Appearance = Colorless gas | Odor = Fishy, ammoniacal | Density = 649.6 kg m−3 (at 25 °C) | MeltingPtK = 180.15 | BoilingPtK = 280 to 282 | Solubility = 3.540 kg L−1 | LogP = −0.362 | VaporPressure = 170.3 kPa (at 20 °C) | HenryConstant = 310 μmol Pa−1 kg−1 | pKa = 10.64 | pKb = 3.29 }} |Section3= |Section4= |Section5= }} 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,〔A. B. van Gysel, W. Musin "Methylamines" in ''Ullmann's Encyclopedia of Industrial Chemistry'', 2005 Wiley-VCH Verlag, Weinheim. 〕 but it is also found as a natural product. ==Structure and properties== The molecule consists of a nitrogen atom with two methyl substituents and one proton. Dimethylamine is a weak base and the pKa of the ammonium salt CH3-NH2+-CH3 is 10.73, a value above methylamine (10.64) and trimethylamine (9.79). Dimethylamine reacts with acids to form salts, such as dimethylamine hydrochloride, an odorless white solid with a melting point of 171.5 °C. Dimethylamine is produced by catalytic reaction of methanol and ammonia at elevated temperatures and high pressure:〔 〕 :2 CH3OH + NH3 → (CH3)2NH + 2 H2O 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「dimethylamine」の詳細全文を読む スポンサード リンク
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