Dialkyl ammonium

P, P-DIMETHYLCYSTEINE see MCR750 DIMETHYI. DIALKYL AMMONIUM CHLORIDE see DRI500... 

Figure 6.11 shows the activity of an artificial enzyme can be controlled based on the phase behavior of a lipid bilayer. The catalytic site for hydrolysis was supplied by a monoalkyl azobenzene compound with a histidine residue which was buried in the hydrophobic environment of a hpid bilayer matrix formed using a dialkyl ammonium salt. Azobenzene compound association depended on the state of the matrix bilayer. The azobenzene catalyst aggregated into clusters when the bilayer matrix was in a gel state. In contrast, the azobenzene derivative can be dispersed into the liquid crystalhne phase of the bilayer matrix above its phase transition temperature. This bilayer-type artificial enzyme catalyzed the hydrolysis of a Z-phenylalanine p-nitrophenyl ester. The activation energy for this reaction in the gel state is twice as large as that observed in the hquid crystalline state. The clustering of the catalysts upon phase separation suppress their catalytic activity, probably due to the disadvantageous electrostatic environment around the catalysts and the suppressed substrate diffusion. This activity control is unique to such molecular assembhes. 

Kreher et al. drew attention to the potential of /V,/V-dialkyl-ammonium N ,N -dialkylcarbamates for use as distillable ionic media [122], However, this class of ILs is generally considered to be a special case since the IL dissociates during distillation to give the respective amine and carbon dioxide. It is also widely recognized that many protic ionic liquids are distillable under easily accessible conditions [123],... 

U.S. 5747436 (1998) Petal et al. (Colgate-Palmolive) Anionic and amphoteric surfactants complex acidramine (1 1 mole ratio) mixture of monoalky and dialkyl ammonium Improved antistatic properties fee of silicone... 

Dimethyl dialkyl ammonium chloride. See Dialkyl dimethyl ammonium chloride Dimethyl diallyl ammonium chloride CAS 7398-69-8 EINECS/ELINCS 230-993-8 Synonyms DAC DADMAC Diallyl dimethyl ammonium chloride DIMDAC 2-Propen-1-aminium, N,N-dimethyl-N-2-propenyl-, chloride Classification Quat. ammonium monomer Empirical CsHieCIN Formula (CH3)2N(CH2CH=CH2)2 Cr Properties M.w. 161.80 Toxicology LD50 (oral, rat) >10 g/kg TSCA listed... 

Dialkyl ammonium quaternaries Dioctyldimethylammonium chloride Didecyldimethylammonium chloride Didecyldimethylammonium bromide Dialkyidimethylammonium chloride Dicocodimethylammonium chloride Benzyl quaternary ammonium compounds Cocobenzyldimethylammonium chloride Coco(fractionated)benzyldimethylammonium chloride... 

The incorporation of dimethyl-dialkyl ammonium treated montmoril-lonite clay does not alter the impact toughness in sub-zero temperatures, whereas the addition of nano-clay improves the strength at higher temperatures. However, the fracture toughness of nanocomposites and neat epoxy increases when they are treated with sea water for 180 days. The... 

There has been debate over the mechanism through the years, with some contesting that the reaction took place via a concerted [3 + 21-cycloaddition mechanism (depicted in reaction of 23 and 24). Koldobskii and co-workers suggested that dialkyl ammonium azide (a practically unionized salt based on electrochemical measurements) underwent Diels-Alder type cycloadditions to yield tetrazoles. In addition, a modest solvent... 

X Sugar unit (glucose or galactose) Dialkyl ammonium salts H3—(CH2) — O / OH3... 

The simplest role that a host-guest complex can play is within the context of a template-directed synthesis. For instance, benzo-27-crown-9 receptor 53 can be synthesized using its guest (guanidine) as a template. Similarly, the macrocyclic dibenzo-24-crown-8 55 serves as a receptor for the formation of a host-guest complex with a dialkyl ammonium motif 90—because the alkyl chains... 

Also, Heinig et al. (1997) quantified cetyltrimethylammonium bromide in face lotion by CE with indirect detection (dodecylbenzyldimethylammonium as chromophore) and without pre-treatment. The influence of an organic modifier and electrolyte chromophore was examined obtaining conditions that permit the separation of alkyl and dialkyl ammonium compounds. In reversed-phase LC, benzyltrimethylammonium was used as a chromophore. Comparison of both methods gave results with better reproducibility for LC and similar detection limits for both methods. 

Chem. Descrip. Dialkyl ammonium methoxysulfole Ionic Nature Cationic... 

Dimethyl dialkyl ammonium chloride. See Dialkyl dimethyl ammonium chloride... 

The property of f. to be local irritants of eyes and skin is reduced by ethoxylation. Manufacturing from RR is predominantly done via the fatty nitriles, which are made from fatty acids by reaction with ammonia. The nitriles are reduced by - hydrogenation (batch or continuous) into amines. The reaction conditions determine whether primary, secondary or tertiary amines result. Saturated f are formed when nitriles are hydrogenated at 80-140 °C and 1-4 MPa/lO O bar over Ni catalyst. Unsaturated f can be obtained with Raney Co or Cu-chromite as catalyst. Ammonia has to be present to suppress the formation of secondary amines. Saturated and unsaturated secondary amines are gained in yields of more than 90% if ammonia is vented from the reactor, the reaction temperature is 160-210 °C, and pressure is maintained at 5-10 MPa/50-100 bar. Trialkylamines are produced via the imine R-CH=NH and Schiff base R-CH=N-CH3 with Ni catalyst at 230 °C and 0.7 MPa/7 bar hydrogen pressure. Important amine types, which are the base for making dimethyl dialkyl ammonium compounds, are made by the following reaction ... 

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