Of l-methoxy-2-propanol

It has been discovered that the performances of platinum and palladium catalysts may be improved by promotion with heavy metal salts. However, there is little information available about the role and chemical state of the promoter 8,9). We have recently found that a geometric blocking of active sites on a palladium-on-activated carbon catalyst, by lead or bismuth, suppresses the by-product formation in the oxidation of l-methoxy-2-propanol to methoxy-acetone 10). 

Mandal S and Pangarkar VG. Pervaporative dehydration of l-methoxy-2-propanol with acrylonitrile based copolymer membranes prepared through emulsion polymerization A solubility parameter approach and study of structural impact. J. Memb. Sci. 2002 209(l) 53-66. 

A detailed kinetic modeling and reactor parameter study was carried out on KR of l-methoxy-2-propanol (rac-23f) with vinyl acetate using a PBR filled with immobilized CaLB [117]. The model simulation was validated in a fully automated modular miniplant and was shown to be capable of predicting the key parameters of a KR such as enantiomeric excess and the extent of conversion at a given superficial velocity. 

Oxidations of l-methoxy-2-propanol and l-ethoxy-2-propanol with alkaline ditellura-toargentate(III) are of fractional order in the substrates and subjeet to negative salt effect obs increases with OH but decreases with H4Te06 and a plausible two-electron transfer mechanism has been proposed. ... 

While there is not a traditional surfactant present during the synthesis, the as-received flakes are prepared with a significant amount of l-methoxy-2-propanol... 

Treatment of the 9-fiuoro-l,4-dien-3-ol (15) with 3.5 g-atoms of lithium and l-methoxy-2-propanol in ammonia reductively cleaves the allylic 3-hydroxyl group to give t7 corresponding 3-desoxy compound, but the fluorine... 

This synthetic process is applicable to the preparation of other ketene acetal derivatives of /3-alkoxy alcohols. Examples include the ketene acetal derivatives of tetrahydrofurfuryl alcohol and l-methoxy-2-propanol.3 There are a number of advantages in its use, including a simple, time-saving procedure, readily available and inexpensive reagents, and good yields of ketene acetal obtained by a one-step method. 

Special interest has been devoted to such systems as diethylzinc methanol (7 8) [26 28] and diethylzinc l-methoxy-2-propanol (2 3) [29], since well-defined catalysts were isolated in the form of single crystals in these systems, namely [Zn(OMe)2] [EtZnOMe]6 and [Zn(OCH(Me)CH2OMe)2]2[EtZnOCH... 

The tars are sampled discontlnuously by using impingers with an organic solvent, At the beginning of the sampling train, a liquid-quench system is used. After several experiments with different organic solvents, l-Methoxy-2-Propanol was found to be an excellent solvent for sampling both primary and converted tars. 

The Group of contractors has proposed a number of candidate solvents methanol, isobulyl methyl ketone and l-methoxy-2-propanol. In relatively short R D projects these candidates will be evaluated using a number of selection criteria that were proposed by the group of contractors. These selection criteria are ... 

Many side reactions can occur during the alkylation of an intermediate containing many nucleophilicsites. Bjoersvichetal. (254) studied the influence of various cations on the N/0 regioselectivity in the N-alkylation of acetamidotriiodoisophthalamide derivatives with 3-chloro-l-methoxy-2 propanol and found that the ion gives the best selectivity and... 

The dilute HP-alcohol solution (HP concentration less than 10%) is introduced in a fixed-bed epoxidation reactor. ATi silicalite (TS-1) catalyst is used also in this case, to produce PO from propene and HP. The reaction is carried out at 40 °C and 20 atm pressure. Process PO yield is estimated to be around 95 mol.% by-products are 1,2-propandiol and the ethers formed by the methanolysis of the oxirane ring (l-methoxy-2-propanol and 2-methoxy-l-propanol), which may further react with PO to yield dipropeneglycol monomethylethers. PO may also form propanol hydroperoxides (l-hydroperoxy-2-propanol and 2-hydroperoxy-l-propanol). Other side-reactions such as the decomposition of HP normally occur to a very low extent. 

PO synthesis is carried out in a methanol solvent, propene and 40% HP adjusted with ammonia to pH 4.5 pressure is 25 atm [20a]. The feed stream contains 21.5 wt% propene, 57 wt% methanol and 9.4 wt% HP. In some patents, a different feed composition is reported, containing 43 wt% propene, 43 wt% methanol and 8.4 wt% HP (from the feeding of a 60% solution of HP in water, adjusted to pH 4.5 with 1100 ppm ammonia) [20c]. The effect of temperature is shown in Table 6.3, for anupflow feed. By-products are l-methoxy-2-propanol, 2-methoxy-l-propanol (propene glycol monomethyl ethers) and propene glycol (1,2-propandiol). How-... 

Chemical deactivation by adsorbed impurities or reaction products was identified as a primary cause of catalyst deactivation [42,43,45-48,50]. Deactivation of platinum catalysts in l-methoxy-2-propanol oxidation was attributed to polymeric species formed by aldol-dimerization and detected by chromatographic... 

Group B Embryotoxicity probable even below the MAK. e.g. 2-Methoxy-propanol, 2-methoxypropyl acetate, methyl chloride, chloroform Group C There is no risk of embryotoxicity below the MAK. e.g. Ethanol, 1,1,1-trichloroethane, 1,1-dichloroethene, tri- and tetrachloroethylene, n-hex-ane di(2-ethylhexyl) phthalate, 2-butoxy-ethanol, 2-butoxyethyl acetate, l-methoxy-2-propanol, 1-methoxypropyl acetate, ethylene glycol, butyldiglycol, isoamyl alcohol, 2-isopropoxyethanol, isobutanol, THE, toluene, cyclohexanone, dimethylacetamide, styrene Group D Assessment not yet possible. 

Methoxypropanol [107-98-2] (l-methoxy-2-propanol). Commercially available methoxypropanol also contains small amounts of 2-methoxy-l-propanol. It is a colorless, neutral liquid with a weak pleasant odor that is miscible in all proportions with water and organic solvents. The properties of methoxypropanol are largely comparable to those of ethyl glycol [14.273]. It has a somewhat higher volatility and, as a solvent component in paints and printing inks, improves the wetting of some... 

The use of VMS fluids to remove semi-polar soils requires the use of additives to tailor the solubility. We chose a rosin-based solder flux as a model for such soils. Rosin is a natural product which is a complex mixture rich in tricyclic, partially unsaturated carboxylic acids that contain twenty carbon atoms, and related derivatives. Figure 2 illustrates the impact that addition of a polar solvent (designated a polar solvency enhancer) has on the ability of the VMS fluids to remove solder flux. Although none of the VMS fluids were able to remove much solder flux unassisted, addition of 18 wt% l-methoxy-2-propanol greatly accelerated removal rate and resulted in thorough removal in 5-10 minutes at RT. Fortunately, the VMS fluids are miscible with many polar solvents, so it is easy to tailor solvency to particular soils. 

Psutka, S. Wichterle, I. Isothermal vapour-liquid eqmlibna in the binary and ternary systems composed of 2-propanol, diisopropyl ether and l-methoxy-2-propanol Fluid Phase Equilib. 2004,220, 161-165... 

Although the process is general, for the specific addition process shown in Scheme 8.62, that is, the addition of methanol (methyl alcohol, CH3OH) to 2-methyloxacyclopropane (2-methyloxirane, propylene oxide) (Table 8.6, item 22), it is seen that the acid-catalyzed reaction occurs by a mixture of what appears to be (substrate dependent) SnI and Sn2 processes with the protonated oxygen of the oxirane serving as the leaving group. As shown, both 2-methoxy-l-propanol and l-methoxy-2-propanol are obtained. 

An acrylic resin comprising of 65 wt% 2—hydroxyethyl methacrylate (HEMA), 33 wt% butyl methacrylate (BMA) and 2 wt % dimethylaminoethyl methacrylate (DMAEMA) was made by solution polymerization at 40% solid in xylene/l—methoxy—2—propanol (1/1)- The polymerization was done at 90°C for 6 h using 1% azobisisobutyronitrile initiator. Another acrylic polymer. 

Recently, a new crystalline organozinc enantiomorphic initiator for the stereoselective polymerization of propylene oxide was reported (107). The complex was obtained by reaction of diethylzinc and (dl)-l-methoxy-2-propanol, and it had the following composition ... 

Considerably more information is provided by the reaction of optically active substrates such as (5 )-2-methyloxirane. The reaction of this substrate could be less regioselective than the reaction of 2,2-dimethyloxirane because there is a smaller difference between the steric environments of the two possible sites for reaction. The sites are primary and secondary in 2-methyloxirane, compared to primary and tertiary in 2,2-dimethyloxirane. However, the reaction is stereospecific. Nucleophilic attack occurs at the less substituted site and gives (5)-l-methoxy-2- propanol. 

The reaction of (5)-2-methyloxirane with methanol in the acid-catalyzed reaction is somewhat less regioselective. However, both products result from stereospecific reactions. The major product is (i )-2-methoxy-l-propanol. The minor product, l-methoxy-2-propanol, has the S configuration. 

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