Hexaethyleneglycol

In Figure 1, the log of the cmc is shown as a function of the number of carbon atoms in the hydrocarbon chain, n, . It is clear that the nonionic surfactants (hexaethyleneglycol alkyl ethers) and the zwitterionic surfactants (N-alkyl betaines) exhibit linear relations with similar slopes of about -0.5... 

G(CH2) thus calculated is -705 cal/mol and -657 cal/mol for hexaethyleneglycol alkyl ethers and N-alkyl betaines, respectively, as shown in Table 1. 

The kinetics of the ribozyme-catalyzed reactions were determined by measuring the initial rates of the catalyzed reaction. For reasons of solubility, anthracene-hexaethyleneglycol, and maleimidocaproic acid were used for these measurements. The initial velocities were determined by monitoring the decrease of anthracene absorbance at 365 nm over 5% conversion. The initial rate of the ribozyme-catalyzed reaction was found to be proportional to the ribozyme concentration. The reaction shows saturation-type kinetics with respect to both substrates. Catalysis was examined as a completely random bireactant system. 

RNA is a homochiral polymer. It occurs in nature only in the d configuration. We investigated how the chiral 49nt catalyst affects the stereochemistry of the reaction by analysis of the products by chiral HPLC (Figure 5.3.6). An enantiomeric excess (ee) of >95% was observed for the catalyzed reaction between anthracene-hexaethyleneglycol and N-pentylmaleimide. 

An infinite ID complex [Ag( 14)( 15) with a single-stranded helical chain structure was obtained through the reaction of 6-amino-1-naphthalenesulfonic acid (H-14) and 2-methylpyrazine (15) with Ag2CC>3.58 Furthermore, when tetra- and hexaethyleneglycol-spaced ligands, 1,1 l-(3,6,9-trioxaundecane)diyl-bis(nicotinate) (16) and l,17-(3,6,9,12,15-pentaoxaheptadecane)diyl-bis(nicotinate) (17), were reacted with silver salts, double-stranded helical complexes (as exhibited in Fig. 11.24) were formed.59... 

At ambient temperature N,N-dimethyl-l,4-phenylenediamine (6.47mmol) was dissolved in 250 ml acetonitrile followed by the addition of Na2C03 (3.7 g) and hexaethyleneglycol di-p-toluenesulfonate (6.46 mmol) and the mixture refluxed 72 hours. The mixture... 

At ambient temperature N,N -dimethyl-1,4-phenylenediamine dihydrogen bromide (3.4 mmol) was dissolved in 150 ml acetonitrile, Na2C03 (3.9 g) and hexaethyleneglycol di-p-toluenesulfonate (3.4 mmol) added, and reacted as in Step 1. The crude product was partitioned between CHjClj and water and the product isolated in 25% yield. H- and C-NMR data supplied. 

An emulsion combustion method was developed by Tani et al. [172] for synthesis of alumina and other oxides. The method consists of three steps (i) atomization of a W/O emulsion, (ii) firing the oil phase in the atomized emulsion (SOO C), and (iii) oxidation of the precursors into the metal oxide. In the specific example of aluminum oxide (see BaTiOj for another example), the oil phase was kerosene and the aqueous phase, a solution of Al-nitrate. The surfactants were SUNSOFT 818H, hexa(2-hydroxy-l,3-propyleneglycol)diricinoleate and NP-6, hexaethyleneglycol nonyl phenyl ether. The three components were varied in ratio... 

Figure 6 X-ray structure of podand complexes (a) [NdCl(OH2)(hexaethyleneglycol)]Cl2, triethyleneglycol)]Cl4 2H20 (H atoms omitted), and (c) [HgCl2)2(triethyleneglycol)]. ...

Preparation of the double-stranded helical precursor with copper(l) using the 1,3-phenylene linker turned ont to be qnantitative. Reaction of this tetraphenolic donble helix with two eqnivalents of the di-iodo derivative of hexaethyleneglycol, in the presence of caesinm carbonate, afforded a single isolable copper(I) complex the dicopper(l) knot was isolated in 29% yield after chromatography. H-NMR spectroscopy data indicated that the knot contained a compact helical core. This was fully confirmed by its subsequent X-ray strnctnre determination. The spectacularly improved yield can be increased even further by optimizing the covalent-bond-forming reactions, whose conditions can harm the helical precnrsors. 

Cl sH34Cli,Hg207, Hexaethyleneglycol diethyl ether - mercury(II) chloride (1 2), 39B, 766... 

Fig. 5 Structures of various modifications studied for optimal TLR9-mediated immune response. Cytosine modifications C 2 -dC, Cj 5-hydroxy-2 -dC, C2 5-propyne-2 -dC, C3 furano-2 -dT, C4 pyrrolo-2 -dC, C5 dF, Cg 4-thio-2 -dU, Cy N -methyl-2 -dC, Cs N -ethyl-2 -dC, C9 P-iso-2 -dC, and Cio arabinoC. Guanine modifications G 2 -dG, Gj 7-deaza-2 -dG, Gy 7-deaza-8-aza-2 -dG, G3 9-deaza-2 -dG, G4 6-(9-methyl-2 -dG, G5 N -methyl-2 -dG, Gg N -methyl-2 -dG, Gy 6-thio-2 -dG, Gs 2 -deoxyinosine, G9 8-G-methyl-2 -dG, Gw 8-G-allyl-2 -dG, and Gn arabinoG. Linkers (L) Lj glycerol (1,2,3-propanetriol), Ly (5)-(-)-l,2,4-butanetriol, L3 1,3,5-pentanetriol, L4 cis, cis-l,3,5-cyclohexanetriol, L cis,trans-l,3,5-cyclohexanetriol, Lg l,3,5-tris(2-hydroxyethyl) isocyanurate, Ly tetraethyleneglycol, and Lg hexaethyleneglycol...

Surface tension curves of mixtures of LiFOS and hexaethyleneglycol n-do-decylether (6ED) are consistent with mixed-micelle formation [125]. The surface... 

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