Isopropanol-water

Thymine [65-71-4] M 126.1, m 326", pK 9.82. Crystd from ethyl acetate or water. Purified by preparative (2mm thick) TLC plates of silica gel, eluting with ethyl acetate/isopropanol/water (75 16 9, v/v Rp 0.75). Spot localised by uv lamp, cut from plate, placed in MeOH, shaken and filtered through a millipore filter, then rotary evapd. [Infante et al. J Chem Soc, Faraday Trans 1 68 1586 1973.]... 

This Crude product (15.8 g) In water (360 ml) was added to a prehydrogenated suspension of 10% palladium on charcoal (4 g) in water (400 ml), and hydrogenation was continued for 30 minutes. The catalyst was removed and the filtrate was adjusted to pH 7.5 with sodium bicarbonate, then evaporated at low temperature and pressure. The residue was purified by chromatography on a column of cellulose powder, eluting first with butanol/ ethanol/water mixture and then with acetone/isopropanol/water. The main fraction was evaporated at low temperature and pressure to give a 32% yield of the sodium salt of a-carboxybenzylpenicillin as a white powder. The product was estimated by manometric assay with penicillinase to be 58% pure. 

The filtrate is evaporated under vacuum and the residue is crystallized from a solution of 60 parts of isopropanol in 75 parts of water. There are obtained 9 parts of N-(3-sulfamyl-4-chlorobenzamido)-2-methyl indoline, MP (K) 184° to 186°C, MP (MK) 160° to 162°C (isopropanol/water). [The melting points being determined on a Kofler heater plate under the microscope (MK) or on a Kofler Bank (K)]. ... 

Styrene AIBN PAAc Isopropanol/water I-Butanol/water 1.4-3.3 89... 

Lu et al. [86] also studied the effect of initiator concentration on the dispersion polymerization of styrene in ethanol medium by using ACPA as the initiator. They observed that there was a period at the extended monomer conversion in which the polymerization rate was independent of the initiator concentration, although it was dependent on the initiator concentration at the initial stage of polymerization. We also had a similar observation, which was obtained by changing the AIBN concentration in the dispersion polymerization of styrene conducted in isopropanol-water medium. Lu et al. [86] proposed that the polymerization rate beyond 50% conversion could be explained by the usual heterogenous polymer kinetics described by the following equation ... 

Isopropanol/Water 740mm Hg Pall Ring, 1 in. Metal 0.6-1.5... 

Fonr mobile phases (mixtures of chloroform, isobutanol, isopropanol, water, and acetic acid) separately and in combination... 

Certain other metal ions also exhibit catalysis in aqueous solution. Two important criteria are rate of ligand exchange and the acidity of the metal hydrate. Metal hydrates that are too acidic lead to hydrolysis of the silyl enol ether, whereas slow exchange limits the ability of catalysis to compete with other processes. Indium(III) chloride is a borderline catalysts by these criteria, but nevertheless is effective. The optimum solvent is 95 5 isopropanol-water. Under these conditions, the reaction is syn selective, suggesting a cyclic TS.63... 

Employing similar procedures, PPO-fc-POEGMA block copolymers and POEGMA-fc-PPO-fc-POEGMA triblock copolymers were prepared from the corresponding PPO macroinitiators [129]. The polymerizations were performed in a isopropanol/water (70/30) mixture at 20 °C using CuCl and bpy. The methacrylate monomer was almost quantitatively polymerized, and the polydispersities were lower than 1.25 in most cases. Less than 5% PPO homopolymer contamination was detected by SEC analysis. 

Isopropanolamines, 20 795, 812 2-Isopropanol-water system, evolving separation strategies for, 22 322-325. See also Water- IPA-hexane system Isopropenyl acetate, 7 148 74 596 m-Isopropenyl-a,a-dimethylbenzyl isocyanate (TMI), 25 463 Isopropenyl methyl ether, production from acetone, 7 163... 

Ethanol Isopropanol Isopropanol / Ethanol Isopropanol / Water Ethanol / Ethyleneglycol Ethanol / Methanol Ethanol / Water Ethanol / Acetone... 

LC-PB-MS has been investigated as a potential confirmatory method for the determination of malachite green in incurred catfish tissue (81) and of cephapirin, furosemide, and methylene blue in milk, kidney, and muscle tissue, respectively (82). Results showed that the mobile-phase composition, nebulization-de-solvation, and source temperature all play an important role in the sensitivity of the method. The sensitivity increases with decreasing heat capacity of the mobile phase in the order methanol acetonitrile isopropanol water and with decreasing flow rate. A comparison of the PB with the thermospray interface showed that less structural information was provided by the latter, whereas the sensitivity was generally lower with the thermospray interface. 

Miranol JEM Concentrate Monoethanol ami ne Butoxyethoxypropanol Isopropanol Water... 

Portalski (P4), 1963 Theories of film flow and methods of measuring film thickness are reviewed. Film thicknesses on vertical plate (zero gas flow) reported for glycerol solutions, methanol, isopropanol, water, and aqueous solutions of surfactants. Results compared with values calculated by Nusselt, Kapitsa, and corrected Dukler and Bergelin treatments. 

Fig. 2. Kinetic curves of the products formation from CNA. b-DPOAi + - DNAj o - CPDAj Catalyst N°9j isopropanol-water (90 10), 100 cm3j CNA 5 gj CNA/catalyst 0 P 1 bar T G0°Cj stirred tank reactor.

A recently reported regioselective photoreduction of benzoates by photosensitized electron transfer reaction was applied to nucleosides [85]. In presence of jV-methyl-carbazole as the electron donor sensitizer and in an isopropanol, water solution, w-trifluoromethylbenzoates of adenosine 83 or benzoates of uridine 84 give deoxygenated products in good yields (73 %). 

Water/ethanol Water/isopropanol Water/glycol, etc. 

A DS of up to 1.0 is obtained in one step by applying optimised reaction conditions 3.8 M aqueous NaOH, reaction temperature of 60 °C for 90 min in tert-butanol/water or isopropanol/water 85 15 (v/v) mixtures (Table 12) [219]. The DS of CMD can be increased by repeated carboxymethy-lations. CMD with DS 1.5 was realised by two-step carboxymethylation. Under optimal conditions, the applied NaOH solution was 3.8 M. The DS value is decreased with lower NaOH concentrations because of incomplete activation of the hydroxyl groups, and also with higher NaOH concentrations due to increasing side reactions of MCA with NaOH forming glycolic acid [280]. 

Method B The conductometric technique (Pawlak, 1980), 0.1 HC1 in isopropanol was used as the titrant and toluene-isopropanol-water (50+49.5+0.5,v/v) was used as the titration medium. 

Method C The calorimetric back titration method, the sample of engine oil was dissolved in a mixture of toluene-isopropanol-water (50 49.5 0.5,v/v) and 0.25 M HC104 in isopropanol-toluene (1 1) was used as the titrant the excess acid was titrated by 1 M (CH3)4NOH in isopropanol. Method D The determination of the TAN and AH was performed by direct calorimetric titration. (CH3)4NOH in isopropanol was used as the titrant and a toluene-isopropanol-water (50 49.5 0.5,v/v) was used as the solvent... 

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