Methanol-ethyl acetate

An internal standard of 1-butanol is used to determine the concentrations of one or more of the following impurities commonly found in whiskey acetaldehyde, methanol, ethyl acetate, 1-propanol, 2-methyl-1-propanol, acetic acid, 2-methyl-1-butanol and 3-methyl-1-butanol. A packed column using 5% Garbowax 20m on 80/120 Garbopak B and an EID detector were used. 

Stannous Chloride Dihydrate. A white crystalline soHd, stannous chloride dihydrate is prepared either by treatment of granulated tin with hydrochloric acid followed by evaporation and crystallisation or by reduction of a stannic chloride solution with a cathode or tin metal followed by crystallisation. It is soluble in methanol, ethyl acetate, glacial acetic acid, sodium hydroxide solution, and dilute or concentrated hydrochloric acid. It is soluble in less than its own weight of water, but with much water it forms an insoluble basic salt. 

Substances />-Anisidine Phthalic acid Methanol Ethyl acetate... 

Figure 10.16 Densitograms obtained for four subsequent developments of the extract from Radix rhev. (a) first development, 10% (vol/vol) ethyl acetate/chloroform, distance 9 cm (b) second development, 50% (vol/vol) ethyl acetate/chloroform, distance 9 cm (c) tliird development, 100% ethyl acetate, distance 8 cm (d) fourth development, 15% (vol/vol) methanol/ethyl acetate, distance 5 cm. Reprinted from Chromatographia, 43, G. Matysik, Modified programmed multiple gradient development (MGD) in the analysis of complex plant exti acts , pp. 39-43, 1996, with permission from Vieweg Publishing.

Chloro-1 -methyl-5-phenyl-s-trizolo[4,3-a]quinoline A stirred mixture of 6triethyl-orthoacetate (0.925 g,0.0057 mol) and xylene (100 ml) was refluxed, under nitrogen, for 2 hours 40 minutes. During this period the ethanol formed in the reaction was removed by distillation through a short,glass helix-packed column. The mixture was concentrated to dryness In vacuo and the residue was crystallized from methanol-ethyl acetate to give 1.28 g of 7-chloro-1-methyl-5-phenyl-s-triazolo[4,3-a]-quinoline (83.9% yield). The analytical sample was crystallized from methylene chloride methanol and had a melting point 252.5°-253.5°C. 

From 13.1 g of N-preduction with Raney-nickel and hydrogen, in which reaction the substance may be suspended in methanol or dissolved in methanol-ethyl acetate at normal pressure and at about 40°C with combination of the theoretical quantity of hydrogen, 12.2 g are obtained of o-emino-N-pfrom aqueous methanol hasaMPof90°C. 

Acetone, THF, methanol, ethyl acetate, isopropyl acetate, isopropyl alcohol, ethanol, n-propyl alcohol, toluene, and 2-methoxyethanol... 

CS2 + 1% methanol CS2 + 5% 2-propanol CS2 -t 1% 2-propanol Isopropanol CS2 -t 1% butanol Methylene chloride -t 5% methanol Ethyl acetate 0.5 ml... 

The extracts of plant, soil and water samples, if necessary, should be purified with the following method prior to methylation Dissolve the residue prepared as in Section 6.1.2 or 6.2.1 in 5 mL of ethyl acetate and transfer the solution into a silica gel mini column. Rinse the column with 15 mL of ethyl acetate. Allow the solution to percolate through the column and discard the eluate. Collect the bispyribac in a 50-mL round-bottom flask with 20 mL of methanol-ethyl acetate (3 7, v/v). Evaporate the eluate to dryness under pressure. 

Kieselgel G impregnated with 3.85% aqueous ammonium acetate Methanol/ethyl acetate/ water/25% ammonium hydrox-ide/pyridine/3.85% aqueous ammonium acetate (100 20 60 20 10 200) 0.08 ) ) ) ) ) ) ) ) )... 

Kieselgel G Butanol/methanol/ethyl acetate/water/25% ammonium 0.06 ... 

A similar RP-HPLC method has been developed for the determination of isoflavones in soybean powder. Ground soybean powder (100 g) was extracted four times with 300 ml of hexane, then the defatted powder was extracted with six solvents or solvent mixtures such as acetone, methanol-water (4 1, v/v), methanol-ethyl acetate-acetone (1 1 1, v/v), acetone-0.1 M HC1 (5 1, v/v), methanol-water (4 1, v/v) plus 0.1 M HC1 (5 1, v/v), and methanol-ethyl acetate-acetone (1 1 1, v/v) plus 0.1 M HC1 (5 1, v/v). An aliquot of 0.5 g defatted or non-defatted soybean powder was shaken for 2h or sonificated for lh with 5 ml... 

Its hydrobromide salt Is also crystalline with a melting point of 214-218°C. The hydrochloride is soluble In water, methanol, ethanol, aniline, and methylene chloride, and the base is almost insoluble in water and soluble in toluene, methanol, ethyl acetate, kerosene, and methylene chloride. The base (SNB) is crystalline with a melting point of 46-46.5°C. 

Sodium benzylpenicillin [69-57-8] M 356.4. Crystd from methanol-ethyl acetate. 

A method of prediction of the salt effect of vapor-liquid equilibrium relationships in the methanol-ethyl acetate-calcium chloride system at atmospheric pressure is described. From the determined solubilities it is assumed that methanol forms a preferential solvate of CaCl296CH OH. The preferential solvation number was calculated from the observed values of the salt effect in 14 systems, as a result of which the solvation number showed a linear relationship with respect to the concentration of solvent. With the use of the linear relation the salt effect can be determined from the solvation number of pure solvent and the vapor-liquid equilibrium relations obtained without adding a salt. 

The salt effect is attributable to the formation of preferential solvation from the standpoint of molecular structure. In other words, when calcium chloride, which dissolves readily in methanol but very little in ethyl acetate, was added to the methanol-ethyl acetate system to saturation, calcium chloride formed with methanol the preferential solvate which may be written CaCl2 6CH30H. It was also shown from the observation of solubility that the solvated methanol molecules did not participate in the vapor-liquid equilibrium. 

Vegetal materials, such as wheat (55), corn (56), fruit, and vegetables (33,57-59), and animal materials, such as beef tissues (60,61), or blubber samples from marine mammals (62) can be extracted by organic solvents using a Waring blender or Soxhlet extraction. The organic solvents that have been used for this purpose are acetonitrile, ethyl acetate-methanol, ethyl acetate, hexane, acetone, and benzene. 

Chromasil C18 Acetonitrile /methanol /ethyl acetate 430 chi, pheo, chlid, Pea, celery 125... 

The amino dlol was purchased from Aldrich Chemical Company, Inc. and was recrystallized before use from methanol/ethyl acetate (the material used had mp 111-113°C). 

When ozonised oxygen is passed through a solution of an ethylenic compound in an inert solvent (e.g. methanol, ethyl acetate, glacial acetic acid, chloroform or hexane) preferably at a low temperature (—20 to — 30 °C), ozone adds on readily and quantitatively to the double bond to give an ozonide (1) ... 

Allow a mixture of 0.5 g of the tertiary amine and 0.5 ml of colourless methyl iodide to stand for 5 minutes. If reaction has not occurred, warm under reflux for 5 minutes on a water bath and then cool in ice-water. The mixture will generally set solid if it does not, wash it with a little dry ether and scratch the sides of the tube with a glass rod. Recrystallise the solid product from absolute ethanol or methanol, ethyl acetate, glacial acetic acid or ethanol-ether. 

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