Dialkyldimethylammonium chloride

Benzenetellurinic Anhydride6 A mixture of 2.04 g (5.0 mmol) of diphenyl ditellurium, 0.15 g 2HT —75 (mixture of dialkyldimethylammonium chlorides), 38 ml tetrahydrofuran, and 38 ml 50% aqueous sodium hydroxide is vigorously stirred in an open beaker. After 3 h of stirring, the initially dark-red mixture has... 

Another method to generate sodium arenetellurolates for subsequent alkylation is the disproportionation of diaryl ditellurium in basic medium to arenetellurolates and arenetellurinates. When the disproportionation reactions arc carried out in the presence of a primary alkyl bromide or alkyl chloride and a dialkyldimethylammonium chloride as phase-transfer reagent, alkyl aryl telluriums are obtained in approximately 60% yield. 

Copolymerization with other water-soluble monomers is also carried out in a similar manner. Cationic polyacrylamides are obtained by copolymerizing with ionic monomers such as dimethylami-noethyl methacrylate, dialkyldimethylammonium chloride, and vinylbenzyltrimethylammonium chloride. These impart a positive charge to the molecule. Anionic character can be imparted by copolymerizing with monomers such as acrylic acid, methacrylic acid, 2-acrylamido-2-methyl-propanesulfonic acid, and sodium styrene sulfonate. Partial hydrolysis of polyacrylamide, which converts some of the amide groups to carboxylate ion, also results in anionic polyacrylamides. 

Reactions of fiber with crotyl chloride, methyl iodide and butyl chloride have led to an improvement in dimensional stability. Decay resistance has also been investigated for wood treated with fatty dialkyldimethylammonium chlorides and bromides. Treated wood showed good resistance against brown rot fungi [40]. 

Some surfactants possessing two hydrocarbon chains attached to a single head group, e.g. the dialkyldimethylammonium chlorides, form lamellar structures when dispersed in aqueous solution. When such turbid solutions are subjected to ultrasonic irradiation, optically clear solutions are formed in which the surfactant is dispersed in the form of closed vesicles [104] similar in structure to the liposomes formed by phospholipids. The use of these totally synthetic bilayer vesicles as model membranes and as potential drug delivery systems is currently under investigation. 

Poly(l,2-dimethyl-5-vinylpyridinium methyl sulfate) Poly(styrenesulfonate) Poly(dialkyldimethylammonium chloride) Poly(ethylene-co-vinyl acetate)... 

HPLC methods are the most convenient for determining, for example, monoalkyltri-methyl- and trialkylmethylammonium chloride impurities in dialkyldimethylammonium chloride. This analysis is described in Chapter 7. 

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