Dimethylammonium

If the metlijlainiiie hydrochloride in solution from the previous re.action be heated with a further quantity of formalin at 115° dimethylamine hydrochloride (dimethylammonium chloride) may be isolated ... 

A -Benzyl-A -methylephedrinium bromide [benzyl(2-hydroxy-l-methyl-2-phenethyl) dimethylammonium bromide] [58648-09-2] M 350.3, m 209-211 , 212-214 , [al -3.8 (c... 

Chemical Name Bis[Ethyl(2-hydroxyethyl)dimethylammonium] sulfate -bis(dibutylcarba-mate)... 

A solution made up of 10 grams of m-dimethylaminophenol, 50 cc of acetone and 13 gram of ethyl iodide was heated at 50°C for five hours. On addition of ether to the cooled solution, (3-hydroxyphenyl)ethyl dimethylammonium iodide precipitated as an oil which soon crystallized. Upon recrystallization from isopropanol the compound had a MP of 113° to 115°C. 

A slight excess of a 10% sodium hydroxide solution was added to a solution of 23 grams of silver nitrate in 300 cc of water. The precipitated silver oxide was washed free of silver ion with distilled water. To a suspension of the silver oxide in 200 cc of water, a solution of 25 grams of (3-hydroxyphenyl)ethyl dimethylammonium iodide in 300 cc of water was added. The precipitate of silver iodide was removed by filtration and the filtrate concentrated to a volume of about 100 cc In vacuo. The remainder of the water was removed by lyophilization. (3-hydroxyphenyl)ethyl dimethylammonium hydroxide was obtained as a hygroscopic, amorphous solid,... 

A solution of 5 grams of (3-hydroxyphenyl)ethyl dimethylammonium hydroxide in about 200 cc of water was neutralized with dilute hydrochloric acid. On concentration to dryness in vacuo, (3-hydroxyphenyl)ethyl dimethylammonium chloride crystallized. The compound was recrystallized from isopropanol MP 162° to 163°C (with decomposition). 

Polydiallyl-dimethylammonium chloride polymers Polyelectrolytes Polyether glycols Polyethersulfone RO membranes Polyethoxylates, as adjuncts Polyethylene glycol... 

Azidochloromethylene)dimethylammonium chloride (2.62) is another reagent which can be used to introduce a diazonio group directly into a phenol (Kokel and Viehe, 1980). 

Aliphatic or aromatic aldehydes RCHO can be transformed, in situ, via their iminium iodides, on reaction with enamines of ketones, to give /9-aminoketones. Thus, 4-methoxybenzaldehyde reacts with dimethylammonium chloride, triethyla-... 

N-benzyl-N-phenethyl-N,N-dimethylammonium chloride loses predominantly benzyl when heated with thiophenoxide, giving stable N,N-dimethylphenethylamine (47) ... 

Polar substituents have been attached to the porphyrin core in order to achieve water-solubility. (685) has been synthesized by reaction of the Ni11 complex of tetrakis(pentafluorophenyl)-porphyrin with dimethylammonium hydrochloride in DMF, followed by methylation with methyl trifluoromethanesulfonate (triflate) in trimethyl phosphate.1778 The triflate and chloride salts are... 

The semi-crystalline mass exploded when stirred after standing overnight. The preparation was based on a published method used uneventfully for preparation of ammonium, dimethylammonium and piperidinium perchlorates [1], Its use in explosives and propellants has been surveyed [2],... 

After a thermal runaway reaction dining chlorination in DMF solution, investigation revealed that saturated solutions of chlorine in DMF are hazardous, and will self-heat and erupt under either adiabatic or non-adiabatic conditions. Principal products are tetramethylformamidinium chloride and carbon dioxide, with dimethylammonium chloride and carbon monoxide in small amounts. A detailed account of the mechanism is to be published. 

A range of bis(tetrachlorocatecholato)spirophosphoranides 91 and 92 have been prepared from diones <2002EJ03580>. Careful fine-tuning of the polarity of the solvent mixture was required for the precipitation of the dimethylammonium salts of the spirophosphoranides. A Cj-symmetric spirophosphoranide 93 with three different bidentate ligands was also prepared. The synthesis required the addition of the dione to a phosphoramidite generated... 

Lappert has described the three-fragment oxidative addition of (halomethylene) dimethylammonium halides to Ru and Ir ds complexes (62,72). The products are compounds containing the secondary carbene ligand CHNMe2, e.g.,... 

The reaction is complete when the clear supernatant solution in the reaction vessel no longer contains chlorine as detected by the addition of dilute nitric acid and silver nitrate solution to ca. 1-ml. of the clear solution withdrawn from the reaction flask. After the reaction is complete, the ice bath is removed, and stirring is continued for 2 hours at room temperature. After standing overnight, the dimethylammonium chloride is filtered and washed with n-hexane, with careful exclusion of the moisture of the atmosphere. The combined filtrates are distilled at atmospheric pressure to remove the solvent. The tris(dimethylamino)arsine distills at 36°/2 mm. (55 to 57°/10 mm.). The yield is 402 g. (78%). 

The apparatus shown in Fig. 16 is set up in the fume hood. The equipment is flushed with dry nitrogen, then a 200-ml. portion (314.8 g., 2.29 mols) of phosphorus trichloride is placed in the 2-1. reaction flask. The flask is partially immersed in the Dry Ice-isopropyl alcohol bath the clamp to the alkylamine container is opened and a stream of dry nitrogen is passed through the system at a rate of about 30 cc./minute measured at S.T.P. The nitrogen stream sweeps the anhydrous amine (200 g.) from the bottle into the reactor. The amine usually condenses on one of the two cold fingers of the reactor and drips into the chilled stirred phosphorus trichloride solution. Finely divided dimethylammonium chloride precipitates immediately. 

The product is a water-white liquid with an obnoxious odor. It boils at 150°/760 mm. It is reactive toward water and amines, and reacts slowly with atmospheric oxygen. On long standing, it deposits small amounts of dimethylammonium chloride. 

X.H. Chen, H. Xie, J.L. Kong, and J.Q. Deng, Characterization for didodecy, 1-dimethylammonium bromide liquid crystal film entrapping catalase with enhanced direct electron transfer rate. Biosens. Bioelectron. 16, 115-120 (2001). 

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