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Dimethylamine is a weak base and the pKa of the ammonium CH 3-NH + 2 -CH 3 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.
The Gmelin rare earths handbook lists 1522 °C and 1550 °C as two melting points given in the literature, the most recent reference [Handbook on the chemistry and physics of rare earths, vol.12 (1989)] is given with 1529 °C.
DMA is prepared commercially by the reaction of dimethylamine with acetic anhydride or acetic acid. Dehydration of the salt of dimethylamine and acetic acid also furnishes this compound: [5] CH 3 CO 2 H·HN(CH 3) 2 → H 2 O + CH 3 CON(CH 3) 2. Dimethylacetamide can also be produced by the reaction of dimethylamine with methyl acetate. [6]
NDMA forms from a variety of dimethylamine-containing compounds, e.g. hydrolysis of dimethylformamide. Dimethylamine is susceptible to oxidation to unsymmetrical dimethylhydrazine, which air-oxidizes to NDMA. [15] In the laboratory, NDMA can be synthesised by the reaction of nitrous acid with dimethylamine: HONO + (CH 3) 2 NH → (CH 3) 2 NNO ...
DMAPA is commonly produced commercially via the reaction between dimethylamine and acrylonitrile (a Michael reaction) to produce dimethylaminopropionitrile. A subsequent hydrogenation step yields DMAPA: [2] DMAPA is readily converted to the mustard dimethylaminopropyl-3-chloride, a powerful alkylating agent. [3]
Melting point: −61.00 °C; −77.80 °F; 212.15 K ... Because it is bulky, it is a more selective nucleophile than other similar amines, such as dimethylamine. [5]
Lauryldimethylamine oxide (LDAO), also known as dodecyldimethylamine oxide (DDAO), is an amine oxide–based zwitterionic surfactant, with a C 12 (dodecyl) alkyl tail. It is one of the most frequently-used surfactants of this type. [4]
The ultimate products of its hydrolysis is titanium dioxide and dimethylamine: Ti(NMe 2) 4 + 2 H 2 O → TiO 2 + 4 HNMe 2. In a related reaction, the compound undergoes exchange with other amines, evolving dimethylamine. TMAT has been used in metalorganic chemical vapor deposition (MOCVD). [citation needed]