Dodecyl methyl carbonate

In 1995, Adeka Corporation discovered carbonates containing long-chain alkyl carbonates, such as dodecyl methyl carbonate (154) [148],... 

PMPS, PMHS, PMDS, and PDHS. Individual resonances are observed for each carbon type, except for the dodecyl polymer in which C-4 to C-9 in the side chain are not completely resolved. The carbon resonances can also be assigned without the use of model compounds by using standard two-dimensional NMR techniques (2). C-1 and, in some cases, C-1, C-2, or both in the three asymmetrically substituted polymers show shift dispersion, which results from the many different stereochemical sequences along the polymer chain. The methyl carbon in PMPS is resolved to at least the pentad level of stereosequences. This chemical shift information can be analyzed to provide a description of the chain statistics resulting from a particular polymerization. 

Successful results have been obtained (Renfrew and Chaney, 1946) with ethyl formate methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, sec.-butyl and iso-amyl acetat ethyleneglycol diacetate ethyl monochloro- and trichloro-acetates methyl, n-propyl, n-octyl and n-dodecyl propionates ethyl butyrate n-butyl and n-amyl valerates ethyl laurate ethyl lactate ethyl acetoacetate diethyl carbonate dimethyl and diethyl oxalates diethyl malonate diethyl adipate di-n-butyl tartrate ethyl phenylacetate methyl and ethyl benzoates methyl and ethyl salicylates diethyl and di-n-butyl phthalates. The method fails for vinyl acetate, ieri.-butyl acetate, n-octadecyl propionate, ethyl and >i-butyl stearate, phenyl, benzyl- and guaicol-acetate, methyl and ethyl cinnamate, diethyl sulphate and ethyl p-aminobenzoate. 

The ability to disperse the calcium soap formed from a given amount of sodium oleate has been studied for a number of a-sulfo fatty acid esters with 14-22 carbon atoms [28,30]. In principle, the lime soap dispersion property increases with the number of C atoms and the dissymmetry of the molecule. Esters with 14 C atoms have no dispersion power and in the case of esters with 15-17 carbon atoms the least symmetrical are the better lime soap-dispersing agents. However this property does not only depend on the symmetry but on the chain length of the fatty acid group. For example, methyl and ethyl a-sulfomyristate have better dispersing power than dodecyl propionate and butyrate. The esters with 18 and more carbon atoms are about equal in lime soap dispersion power. Isobutyl a-sulfopalmitate is the most effective agent under the test conditions. 

A phosphate-free detergent with excellent detergency and improved foaming and rinsing properties consists of 10% sodium a-sulfo hardened beef tallow fatty acid methyl ester, 10% sodium dodecyl sulfate, 5% a-sulfomyristic acid disodium salt, 10% zeolite, 10% sodium silicate, 10% sodium carbonate, 10% cellulose, 40% Flauber s salt, and 4% water [80]. 

A detergent, imparting better flexibility to cotton cloth is produced by adding 1% sodium a-sulfo hardened tallow fatty acid methyl ester and 9% disodium a-sulfo hardened palm oil fatty acid to a mixture of 5% sodium n-dodecyl-benzenesulfonate, 5% a-C16-olefmsulfonate, 3% dimethyldistearylammonium chloride, 15% zeolite, 10% sodium silicate, 10% sodium carbonate, 2% soap, 35% Na2S04-7H20, and 5% water [84],... 

There is a recent trend towards simultaneous CE separations of several classes of food additives. This has so far been applied to soft drinks and preserved fruits, but could also be used for other food products. An MEKC method was published (Lin et al., 2000) for simultaneous separation of intense sweeteners (dulcin, aspartame, saccharin and acesulfame K) and some preservatives (sorbic and benzoic acids, sodium dehydroacetate, methyl-, ethyl-, propyl- and isopropyl- p-hydroxybenzoates) in preserved fruits. Ion pair extraction and SPE cleanup were used prior to CE analysis. The average recovery of these various additives was 90% with good within-laboratory reproducibility of results. Another procedure was described by Frazier et al. (2000b) for separation of intense sweeteners, preservatives and colours as well as caffeine and caramel in soft drinks. Using the MEKC mode, separation was obtained in 15 min. The aqueous phase was 20 mM carbonate buffer at pH 9.5 and the micellar phase was 62 mM sodium dodecyl sulphate. A diode array detector was used for quantification in the range 190-600 nm, and limits of quantification of 0.01 mg/1 per analyte were reported. The authors observed that their procedure requires further validation for quantitative analysis. 

Cetyltrimethyl ammonium bromide (CTAB) dodecyltrimethyl ammonium bromide (DTAB) tetradecyltrimethyl ammonium bromide (TTAB) trioctyl-methyl ammonium chloride (TOMAC) N-benzyl-N-dodecyl-hf-bis(2-hy-droxy ethyl) ammonium chloride (BDBAC) cetyl pyridinimn chloride (CPC) quaternary ammonium salt with carbon atoms of R ranging from 8-10 (CHj Rj N+ CL) (Aliquat 336)... 

The styrene (Polysciences) was washed with 10 aqueous sodium hydroxide to remove the inhibitor and vacuum-distilled under dry nitrogen the 1-pentanol (Fisher Scientific) was dried over potassium carbonate and vacuum-distilled the potassium persulfate (Fisher Scientific) was recrystallized twice from water the 2,2 -azobls(2-methyl butyro-nltrlle) (E. I. du Pont de Nemours) was recrystallized twice from methanol the sodium dodecyl sulfate (Henkel) was used as received its critical micelle concentration measured by surface tension was 5.2 mM. Dlstllled-delonlzed water was used in all experiments. 

A ferrocene modified siloxane redox polymeric electron transfer system in carbon paste electrodes for aldose biosensors using PQQ-dependent aldose dehydrogenase was reported by Smolander et al. [86]. Polymethyl(ll-ferrocenyl-4,7,10-trioxa-undecanyl)methyl(12-amino-4,7,10-trioxa-dodecyl)-siloxane (1 1 random co-polymer) (Fig. 3.6) was found to be an efficient electron transfer system yieldii better electrode operational stabiUty than those constructed with dimethylferrocene fi ee mediator. The hydrophilic nature of the pendant chain and side chain on dimethyl siloxane units favorably interact with enzjnne causing efficient electron transfer from coenzyme PQQ of aldose dehydrogenase to the electrode surface. 

Most emulsion polymerization is based on free-radical reactions, involving monomers (e.g., styrene, butadiene, vinyl acetate, vinyl chloride, methacrylic acid, methyl methacrylate, acrylic acid, etc.), surfactant (sodium dodecyl diphenyloxide disulfonate), initiator (potassium persulfate), water (18.2MQ/cm), and other chemicals and reagents such as sodium hydrogen carbonate, toluene, eluent solution, sodium chloride, and sodium hydroxide. 

Methyl-2,6-di-t-butylphenol Methyl di-t-butylphenol. See BHT 4-Methyl-7-(diethylamino) coumarin. See 7-Diethylamino-4-methylcoumarin Methyl diglyme. See Diethylene glycol dimethyl ether Methyl digol. See Methoxydiglycol Methyl 1,1-dimethylethyl ether. See Methyl t-butyl ether 4-Methyl-1,3-dioxolan-2-one. See Propylene carbonate Methyl dodecanoate Methyl n-dodecanoate Methyl dodecylate. See Methyl laurate... 

UVA 2,2 -dihydroxy-4-methoxybenzophenone 2-(2H-benzotriazol-2-yl)-p-cresol 2-benzotriazol-2-yl-4,6-di-tert-butylphenol phenol, 2-(5-chloro-2H-benzotriazole-2-yl)-6-(1,1 -dimethylethyl)-4-methyl- 2-(2H-benzotriazole-2-yl)-4,6-di-tert-pentylphenol 2-(2H-benzotriazole-2-yl)-4-(1,1,3,3-tetraethylbutyl)phenol 2-(2H-benzotriazol-2-yl)-4,6-bis(1 -methyl-1 -phenylethyl)phenol 2-(2H-benzotrlazol-2-yl)-6-dodecyl-4-methylphenol, branched linear 2,4-dl-tert-butyl-6-(5-chloro-2H-benzotrlazole-2-yl)-phenol 2-(3-sec-butyl-5-tert-butyl-2-hydroxyphenyl) benzotrlazole reaction product of methyl 3(3-(2H-benz-otrlazole-2-yl)-5-t-butyl-4-hydroxyphenyl proplonate/PEG 300 ethyl-2-cyano-3,3-dlphenylacrylate (2-ethylhexyl)-2-cyano-3,3-dlphenylacrylate N-(2-ethoxyphenyl)-N -(4-lsododecylphenyl)oxamlde N-(2-ethoxyphenyl)-N -(2-ethylphenyl)oxamlde benzoic acid, 4-[[(methylphenylamlno) methylene]amlno]-, ethyl ester Screeners carbon black ... 

Preparation by selective alkylation of 5-tert-butyl-2,4-dihydroxybenzophenone with dodecyl bromide in refluxing methyl ethyl ketone in the presence of potassium carbonate [835]. 

Fig. 10.2 Schematic illustrations and HRTEM images of the different stages in the fabrication of carbon nanorings (CNRs) in the cobalt(II)-aluminum (III) layered double hydroxide (LDH) containing co-intercalated dodecyl sulfonate (DSO) anions and methyl methacrylate (MMA) CoAl-DSO-MMA-LDH matrix (a) the (CoAl-DSO-MMA-LDHCoAl-DSO-MMA-LDH precursor, (b) CoAl-DSO-MMA-LDH after calcination in an Ar atmosphere at 800 °C and (c) isolated CNRs obtained after dissolution of the matrix. Reproduced with permission from [117], Copyright 2013 Wiley...

---