Didodecyl

PEROXIDESAND PEROXIDECOMPOUNDS - ORGANIC PEROXIDES] (Vol 18) Didodecyl 3,3y-thiodipropionate [123-28-4]... 

Alkylbenzyldimethyl quaternaries (ABDM) are used as disinfectants (49) and preservatives. The most effective alkyl chain length for these compounds is between 10 and 18 carbon atoms. Alkyltrimethyl types, alkyl dimethylbenzyl types, and didodecyl dimethyl ammonium chloride [3401-74-9] exhibit excellent germicidal activity (151—159). Dialkyldimethyl types are effective against anaerobic bacteria such as those found in oil wells (94—97). One of the most effective and widely used biocides is didecyl dimethyl ammonium chloride [7173-57-5]. 

Dodecyl heptaoxyethylene ether Copper didodecyl sulfate... 

Dilauryl thiodipropionate Didodecyl 3,3 -thiodipropionate Thiobis(dodecyl propionate) Thiodipropionic acid dilauryl ester Bis(dodecyloxycarbonylethyl) sulfide... 

It has been found that the combination of Lewis acids and surfactants is particularly effective for catalyzing Diels-Alder reactions in water. The effect of micelles of SDS, CTAB, dodecyl heptaoxyethy-lene ether (Q2E7), and copper and zinc didodecyl sulfate [M(DSb] on the Diels-Alder reaction of 3-(p-substituted phenyl)- l-(2-pyridyl)-2-propen-l-ones (Figure 12.1) with cyclopentadiene was studied. 

PM 93120 00123-28-4 Irganox PS800 Thiodipropionic acid, didodecyl ester 5 514.41 Not examined but after Irganox 1076 (Note 1) 515.4 (+ve) Not examined... 

Recently, Porter et al. (1986b, 1988) have reported the synthesis of both meso- and ( )-forms of a series of two-chain carbonyl diacids made by joining two pentadecanoic acid units by a carbonyl group at the 3,3, 6,6, 9,9 and 12,12 positions, 3,5-didodecyl-4-oxoheptanedioic acid (C-15 3,3 ), 6,8-dinonyl-7-oxotridecanedioic acid (C-15 6,6 ), 9,11-dihexyl-10-oxononadecanedioic acid (C-15 9,9 ) and 12,14-dipropyl-13-oxopentacosanedioic acid (C-15 12,12 ), respectively. The diacids were used to probe further the question of stereochemical preference in two-chain amphiphiles. The method used for examining the diastereomeric preference was equilibration by base-catalyzed epimerization in homogeneous, bilayer and micellar media. This method allows for stereoselection based on hydrophobic/hydrophilic considerations rather than classic steric size effects. 

Fig. 2.12.1. Chemical structure of different classes of cationic surfactants (a) quaternary ammonium surfactants (quats) (b) dialkylcarboxyethyl hydroxyethyl methyl ammonium surfactants (esterquats) (c) alkyl polyglycol amine surfactants (d) quaternary perfluoro-alkyl ammonium surfactants (e) N, N, N1, JV -tetramethyl-iV, iV -didodecyle-l,3-propane-diyle-diammonium dibromide (cationic gemini surfactant). R = alkyl or benzyl group.

The influence of various structural and physicochemical parameters of the stationary and mobile phases on the tailing of a cationic dye in reversed-phase chromatography has been studied in detail. Measurements were performed in a C8 reversed-phase column (80 X 4.6 mm). The isocratic mobile phase was ACN-0.01 M aqueous HC1 (90 10, v/v). Analyses were carried out at 20°C and the flow rate was 1-5 ml/min. The concentration of the cationic dye, l,l -didodecyl-3,3,3, 3 -tetramethylindocarbocyanine perchlorate (Dil) in the model solutions varied between 0.9-309 pM. The dependence of the chromatographic profile of the dye on the injected concentration is illustrated in Fig. 3.112. Calculations and mathematical modelling indicated that the peak tailing of the dye can be... 

Figure 9.18 Idealized structures of hydrated didodecyl-phosphatidyl ethanolamine showing some typical bicontinuous cubic phases. (Adapted from Seddon et al, 1990 see this reference for the indicated crystallographic nomenclature.)...

Many single-chain amphiphiles form cubic phases when added to water in a given composition. Two of the most well known are didodecyl-phosphatidyl ethanolamine, and mono-olein. Figure 9.18 shows some idealized bicontinous cubic structures of the former, including typical inverse ones. This is also highly viscous and optically transparent as are most of the other cubic phases. 

Research Focus Synthesis of poly(4,8-didodecyl-2,6-bis-(3-methyl-thiophen-2-yl)-benzo[l,2-b 4,5-b ]dithiophene) derivatives for use as semiconductors in... 

It has been reported that a variety of single-chain amphiphiies spontaneously produce stable, membrane-forming aggregates when dispersed in water 258 260). Dialky 1-amphiphile l-III (l or d means l- or D-configuration of amino acid unit in compound III, respectively), which was prepared by condensation of didodecyl L-glutamate and p-(4-bromobutoxy)benzoic acid and the subsequent quarterization with tri-methylamine, produces bilayer vesicles in water as probed by electron microscopy 251 >. 

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