Water hexane mixed with

When water is mixed with benzene or hexane, two phases form neither liquid is soluble in the other. Nonpolar compounds such as benzene and hexane are... 

A suspension of 30 g of 7-amino-3-methoxymethyl-3-cephem-4-carboxylic acid in 300 ml acetone is mixed with 18.6 g l,8-diazabicyclo[5.4.0]undec-7-ene. The solution obtained mixed at ca. 0°C with 261 g of a 14% toluene solution of 1-iodoethylisopropyl carbonate. After 4 hours the solution is poured onto a mixture of 600 ml of water and 21 ml cone. HCI. The pH of mixture is adjusted to ca. 1.0. The aqueous phase is extracted with 200 ml of hexane, mixed with 700 ml ethyl acetate and pH is adjusted to ca. 8.2. A solution of 7-amino-3-methoxymethyl-3-cephem-4-carboxylic acid 1-(isopropoxycarbonyloxy)ethyl ester is obtained. Diastereoisomeric ratio B/(A+B)=0.49 (B is more apolar of the two diastereoisomers). 

C for 2 h. The next day the white residue was dissolved in 2 ml of 2 M HC1, diluted with 4 ml of distilled water and mixed with 0.5 ml of 5 M sulphuric acid, 0.5 ml of 5 M acetone and 0.05 ml of potassium iodate solution (concentration 100 ppm). After 30 min, the iodoacetone produced was extracted with 5 ml of n-hexane, the organic layer was decanted and 0.2-/ul aliquots were subjected to analysis. It was verified that the column packed with 5% of 1,5-pentanediol succinate at 125°C provided better results than a column packed with SE-30. 

Prepare water solution of Kelzan xanthan gum as before and add next three ingredients. Mix the Brij 96, Silicone and hexane separately. Then add water solution to the si 1icone/hexane mix with constant agitation. For aerosol use charge with 90% concentrate and 10% Genetron 12. 

Bromo-3-iodo-l-(4-methylphenylsulfonyl)indole (0.476 g, 1.00 mmol), methyl acrylate (0.108 g, 1.25 mmol), EtjN (0.127 g, 1.25 mmol) and Pd(OAc)2 (11 mg, 0.050 mmol) were mixed in a tube, purged with argon and the tube was sealed and heated to 100°C for 1 h. After cooling, it was opened and mixed with CH2CI2 (50 ml). The solution was washed with water and dried (Na SOJ. The residue was purified by chromatography on silica using 1 3 benzene-hexane for elution. The yield was 0.350 g (81%). 

Diphenoxylate Hydrochloride. l-(3-Cyano-3,3-diphenylpropyl)-4-phenyl-4-piperidinecarboxyhc acidmonohydrochlorhydrate [3810-80-8] (Lomotil) (13) is a white, odorless, crystalline powder that melts at 220—226°C. It is soluble ia methanol, spariagly soluble ia ethanol and acetone, slightly soluble ia water and isopropyl alcohol, freely soluble ia chloroform, and practically iasoluble ia ether and hexane. The method of preparation for diphenoxylate hydrochloride is available (11). Diphenoxylate hydrochloride [3810-80-8] (13) is an antidiarrheal that acts through an opiate receptor. It has effects both on propulsive motility and intestinal secretion. Commercial forms are mixed with atropiae to discourage abuse. 

The final loose end in the process is the aqueous decanter product, A7. The hexane must be removed before the mixture can be sent to wastewater treatment, ie, accepted as a water by-product. Two opportunistic separations. Fractionators 12 and 13, are possible. Selection of Fractionator 13 gives pure water underflow, and a distillate similar to D5. Distillate D13 can be recycled back and mixed with D5 without affecting the operation of Mixer 1. AH streams are processed and the flow sheet produces both desired products (Fig. 5b). 

The precipitate was then mixed with diatomaceous earth, collected on a filter, and washed with water and extracted with two 100 ml portions of boiling benzene. The aqueous filtrate was extracted with 50 ml of benzene, the combined benzene extracts washed with water and evaporated to dryness under reduced pressure. The crystalline residue, MP 140° to 147°C, weighed 30.8 g. Recrystallization from a mixture of benzene and hexane gave 27.6 g (83%) of 2-chloro-10-(3-dimethylaminopropyl)-10-hydroxythiaxanthene, MP 152° to 154°C. Analytically pure material from another experiment melted at 153° to 154°C. 

Seddon s group described the option of carrying out Heck reactions in ionic liquids that do not completely mix with water. These authors studied different Heck reactions in the triphasic [BMIM][PFg]/water/hexane system [91]. While the [BMIM]2[PdCl4] catalyst used remains in the ionic liquid, the products dissolve in the organic layer, with the salt formed as a by-product of the reaction ([H-base]X) being extracted into the aqueous phase. 

Transfer the residue with 1 g of Florisil PR on to the top of the column packed with 9 g of Florisil PR with the aid of hexane. Rinse the column with 150 mL of hexane-acetone (4 1, v/v). Elute acetamiprid with 120 mL of a mixed solvent of acetone-hexane (1 1, v/v) and concentrate the eluate to near dryness by rotary evaporation at 40 °C. Dissolve the residue with 5 mL of distilled water and apply the solution to the top of the packed Sep-Pak Ci8 column pretreated with 20 mL each of methanol and distilled water. Elute acetamiprid with 30 mL of a mixed solution of water-acetonitrile (17 3, v/v). Concentrate to dryness on a water-bath at ca 40 °C by rotary evaporation. Prepare the GC-ready sample by dissolving the residue in acetone. 

Transfer the sample extract (from Section 6.1) into a 300-mL separatory funnel, add 50 mL of water and extract the sample with 50 mL of n-hexane three times. Separate and dry the n-hexane layer with anhydrous sodium sulfate (plug the funnel with absorbent cotton and 50 g of anhydrous sodium sulfate), and collect the dried extract in a 300-mL of separatory funnel. Add 50 mL of acetonitrile to the separatory funnel and mix well for partitioning with the n-hexane extract three times. Collect the... 

PCBs in biological samples are usually extracted by a Soxhlet column and with a nonpolar solvent such as hexane. The sample is first mixed with sodium sulfate to remove moisture. The extraction of PCBs from sediments was tested with sonication, with two sonications interspersed at a 24-h quiescent interval, with steam distillation, or with Soxhlet extraction (Dunnivant and Elzerman 1988). Comparison of the recoveries of various PCB mixtures from dry and wet sediments by the four techniques and the extraction efficiency of four solvents showed that the best overall recoveries were obtained by Soxhlet extraction and the two sonication procedures. In comparisons of solvent systems of acetone, acetonitrile, acetone-hexane (1+1), and water-acetone-isooctane (5+1.5+1), recoveries of lower chlorinated congeners (dichloro- to tetrachloro-) were usually higher with acetonitrile and recoveries of higher chlorinated congeners (tetrachloro- to heptachloro-) extracted with acetone were superior (Dunnivant and Elzerman 1988). The completeness of extraction from a sample matrix does not seem to discriminate against specific isomers however, discrimination in the cleanup and fractionation process may occur and must be tested (Duinker et al. 1988b). 

If //-hexane is spilled on the ground, much of it will evaporate into the air before it penetrates the soil. Any //-hexane that penetrated the soil would probably be broken down by bacteria. If //-hexane leaks from an underground storage tank, it will float on the groundwater, rather than mixing with it since //-hexane is lighter than water. 

DCC is an inexpensive brittle solid, melting point 34-35°C, that must be crushed or warmed to a viscous liquid to withdraw it from a container. It generates a very bulky A. V -dialkylurca that is insoluble in organic solvents, and, hence, it may interfere with mixing. Filtration removes most of the urea, but it is soluble enough in the usual solvents that its complete removal can be problematic. It is least soluble in water, hexane, or acetone cooling a solution of a product in acetone for a few... 

A C30 RP column has been applied for the separation of carotenoids present in various matrices such as human serum, raw and thermally processed carrots, a Duniella algae-derived preparation and a poultry feed. Samples were mixed with deionized water and CaC03, homogenized and extracted with acetone-hexane (1 1, v/v). 

Because of the importance of soybean and soybean products in both human and animal nutrition their flavonoid content has been investigated many times. Thus, HPLC-UV and HPLC-MS have been applied for the determination of flavonoids and other phytochemicals in soybean extracts and in onion with and without hydrolysis, lg of onion was homogenized and mixed with 8 ml of methanol-water (8 2, v/v). After 2h the suspension was centrifuged at 4°C and the supernatant injected. Powdered soybean (500 mg) was defatted by 2 X 10 ml of hexane and further treated as the onion sample. Flavonoids were hydrolyzed by mixing 2 ml of extract with 2 ml of 2 M HC1 and heated to 130°C for 2 h. The solution was neutralized with 4 M of NaOH. Separation was performed in an ODS column (125 X 4.6 mm... 

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