Hydroxy propyl ether

Di(/3,y-di hydroxy propyl)-ether Trinitrate or Dipropylol-ether Tetronitrate. See Tetra-nitrodlglycerol, under Diglycerol... 

The chromatographic utility of the CD CSPs has been expanded through the development of derivatized CD supports. The currently available derivatized cydodextrin-based CSPs are listed in Table 3 and include acetylated (in a-, p-, and y-CD forms) (S)- and (K,S)-hydroxy-propyl ether (p-CD) (S)- and (R)-naphthylethyl carbamate (p-CD) 3,5-... 

Dextran hydroxypropyl ether. Sephadex LH-20 is the hydroxy-propyl ether of Spehadex G-25 (the number indicates the porosity of the... 

Photolysis of Model Compound II. Compound II, the bis-2-hydroxy propyl ether of bisphenol A, represents a section of a BAE polymer. Figure 4 shows the GC peaks as drawn by the computer and Table II shows the significant peaks that appeared in the GC/MS spectrum and their corresponding m/e ratios. The proposed photodegradation pattern is shown in Scheme 2. 

The separation was achieved on a P-cyclodextrin that carried the hydroxy propyl ether group attached to the lip of the cavity in the 2 and 3-positions. A possible and rational explanation for the chiral selectivity that is achieved is suggested in the diagram. However, it is important to... 

Synonyms Fatty acids, coco, 3-esters with PEG dihydroxymethylsilyl 2,3-d i hydroxy propyl ether... 

Detailed studies using mass spectroscopy on the photolysis of bisphenol-A low molecular model compounds, such as bis(n-propyl ether) of bisphenol-A (2.25), bis(2-hydroxy-propyl ether) of bisphenol-A (2.26) and bis(methylester) of bisphenol-A (2.27), show much more complicated mechanisms [813, 814, 1174] ... 

Cationic Starches. Commercial cationic starches are starch ethers that contain a tertiary amino or quaternary ammonium group, eg, the diethylaminoethyl ether of starch or the 2-hydroxy-3-(trimethylammonio)propyl ether of starch [9063-45-0], sold as its chloride salt [56780-58-6]. 

The first step involves the preparation of 1 -(3-isobutoxy-2-chloro)propyl pyrrolidine as an intermediate. 345 ml of thionyl chloride dissolved in 345 ml of chloroform are added, drop by drop, to 275 g of 1 -(3-isobutoxy-2-hydroxy)propyl pyrrolidine dissolved in 350 ml of chloroform, while maintaining the temperature at approximately 45°C. The reaction mixture is heated to reflux until gas is no longer evolved. The chloroform and the excess of thionyl chloride are removed under reduced pressure. The residue is poured on to 400 g of crushed ice. The reaction mixture is rendered alkaline with soda and the resulting mixture is extracted twice with 250 ml of diethyl ether. The combined ethereal extracts are dried over anhydrous sodium sulfate. After evaporation of the solvent the residue is distilled under reduced pressure. 220 g of product are obtained having the following properties boiling point = 96°C/3 mm, n074 = 1.4575. 

After evaporation of the solvent, a very thick, colorless oil is obtained. This base is dissolved by 200 ml of absolute ethanol and the quantity of HCI to obtain the dihydrochioride is added. It is left for a few hours over ice, dried, washed with approximately 100 ml of anhydrous ether in order to obtain 190 to 195 grams of 1-[2-phenyl-2-methoxy]-ethyl-4-[3-phenyl-3-hydroxy] -propyl-piperazine dihydrochioride after drying at 60°C in vacuo. The yield is 80%. It is recrystallized from absolute ethanol. The product is in the form of white crystalline powder, soluble in water, slightly soluble in alcohol, insoluble in ethyl acetate. 

Preparative photolysis of AETSAPPE (0.25 M aqueous solution) at 254 nm (Rayonet reactor) resulted in the formation of the disulfide product 2-amino(2-hydroxy-3-(phenyl ether) propyl) ether disulfide (AHPEPED) as the primary photoproduct Photolysis of AETSAPPE at 254 nm (isolated line of medium pressure mercury lamp) resulted in rapid initial loss of starting material accompanied by formation (analyzed by HPLC) of AHPEPED (Figure 12a and 12b) (Scheme IV). Similar results were obtained for photolysis- at 280 nm. Quantum yields for disappearance of AETSAPPE and formation of AHPEPED at 254 nm and 280 nm are given in Table I. The photolytic decomposition of AETSAPPE in water was also accomplished by sensitization ( x =366 nm) with (4-benzoylbenzyl) trimethylammonium chloride (BTC), a water soluble benzophenone type triplet sensitizer. The quantum yield for the sensitized disappearance (Table I) is comparable to the results for direct photolysis (unfortunately, due to experimental complications we did not measure the quantum yield for AHPEPED formation). These results indicate that direct photolysis of AETSAPPE probably proceeds from a triplet state. 

Methyl (3-hydroxy)propyl telluride (typical procedure) MeTeLi. A suspension of Te powder (12.8 g, 0.1 mol) in THE (100 mL) is frozen in a liquid N2 bath, and then MeLi (66.7 mL of a 1.5 M solution in ether, 0.1 mol) is injected into the flask. The mixture is allowed to thaw and is stirred magnetically for a further 30 min at room temperature. The resulting yellow-orange solution is stored under N2 and used within 2 h. 

The effect of ions on the degree of hydration of cellulose ethers has been studied. Depending on the polymer, the type and concentration of ions can affect to varying degrees the extent of hydration. Changes in the hydration state result primarily in solution-viscosity and cloud-point changes. These effects were demonstrated with hydroxy propyl cellulose.16... 

Note that some cellulose ether products possess hydroxy-propyl substitutions in addition to methyl substitutions but are designated with the same trade name in a product line, differing only by a unique identifier code. These products should not be confused with the products that contain only methyl substitutions. A specification for methylcellulose is contained in the Food Chemicals Codex (FCC). 

Many ATPS systems contain a polymer which is sugar based and a second one which is of hydrocarbon ether type. Sugar-based polymers include dextran (Dx), hydroxy propyl dextran (HPDx), FicoU (Fi) (a polysaccharide), methyl cellulose (MC), or ethylhydroxyethyl cellulose (EHEC). Hydrocarbon ether-type polymers include poly (ethylene glycol) (PEG), poly (propylene glycol) (PPG), or the copolymer of PEG and PPG. De-rivatized polymers can also be useful, such as PEG-fatty acids or di-ethylaminoethyl-dextran (Dx-DEAE). 

Abbreviations DM, 2,6-di-O-methyl TM, 2,3,6-tri-O-methyl DMA, acetylated DM-P-CyD 2-HE, 2-hydroxyethyl 2-HP, 2-hydroxy propyl 3-HP, 3-hydroxypropyl 2,3-DHP, 2,3-dihydroxypropyl Gi, glycosyl G2, maltosyl GUG, Glucuronyl-glucosyl DE, 2,6-di-0-ethyl TE, 2,3,6-tri-O-ethyl CME, O-carboxymethy 1-0-ethyl TAcyl, 2,3,6-tri-O-acyl (C2 Cig) TValeryl, 2,3,6-tri-O-valeryl SEE, sulfobutyl ether. 

Newer 2-diethylaminoethyl ethers, such as 0-( 2-diethylaminoethyl )-agarose gels," are useful as media for electrophoresis and immunoelec-trophoresis, and the 2-diethylaminoethyl derivative of O-(2-hydroxy-propyl ) cross-linked dextran (Sephadex LH20) is an effective, lipophilic anion-exchanger. The relative stiffness of the molecular chain of 0-(2-diethylaminoethyl) dextran has been estimated from measurements of viscosity at various ionic strengths, and compared with that of other polysaccharide polycations and polyanions. 0-(2-Diethylaminoethyl) dextran itself is claimed to be toxic." ... 

O. WiUce and P. Mischnick, Analysis of cationic starches Determination of the substitution pattern of 0-(2-hydroxy-3-trimethylammonium)propyl ethers, Carbohydr. Res., 275 (1995) 309-318. 

Feng, J., Ogawa, A., Tsukahara, M., and Kunieda, H. (2002) Formation of microemulsion in NaCl aq/sodium (3-dodecanoyloxy-2-hydroxy-propyl) sucdnate/ glycerol mono(2-ethylhexyl) ether/oil systems. /. Dispersion Sci. Technol., 23, 29-36. 

Cellulose, hydrogen sulfate, sodium salt. See Sodium cellulose sulfate Cellulose, hydroxybutyl methyl ether. See Hydroxybutyl methylcellulose Cellulose hydroxyethylate Cellulose hydroxyethyl ether Cellulose, 2-hydroxyethyl ether. See Hydroxyethylcellulose Cellulose, 2-hydroxyethyl 2-hydroxy-3-(trimethylammonio) propyl ether, chloride. See Polyquatemium-10... 

Chitosan, butoxylated. See Butoxy chitosan Chitosan, N-(carboxymethy)-. See Carboxymethyl chitosan Chitosan, N-(3-carboxy-1-propanoyl)-, carboxymethyl derive.. See Carboxymethyl chitosan succinamide Chitosan, 2,3-dihydroxypropyl-2-hydroxy-3-(trimethylammonio)propyl ether, chloride. See Polyquaternium-29... 

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