Ethanol, methane solubility

An extremely pure product results, when difluorochloro methane or difluoro-dichloro methane are used as solvents (79). Dichlorophosphoric acid is a fluid, colourless, very hygroscopic liquid, which is easily soluble in CHCI3, CCI4, Ethanol and Ether (6). In the liquid phase it is stable for some time at room temperature, whereas at 12 Torr there is no sign of decomposition up to 250 °C (6). According to the Raman spectra in the liquid it is dimeric in analogy to the carboxylic acids (20) ... 

The complexes are very soluble in methanol, ethanol, butanol, methyl Cellosolve (2-methoxyethanol), and ethyl Cellosolve (2-ethoxyethanol), and to a fair degree, quite soluble in 1,2-dimethoxyethane and di- and triglyme. They are initially quite soluble in tetrahydrofuran, acetone, pyridine, nitro-methane, acetonitrile, dimethyl sulfoxide, and iV,A/-dimethyl-formamide, but usually precipitation of the nickel halide-solvent complex occurs if attempts are made to prepare moderately concentrated solutions in these solvents. They are only very slightly soluble, or are quite insoluble in dioxane, ethyl ether, hexane, dichloromethane, ethyl acetate, and methyl- and butyl-cellosolve acetate (2-methoxyethyl and 2-butoxyethyl acetate). 

A perrhenic acid solution is prepared as under Part A and is added to a suspension of 25 g. of triphenylphosphine in 250 ml. of absolute ethanol in a 500-ml. round-bottomed flask fitted with a stirrer and a reflux condenser. The solution is stirred while it is heated to boihng and refluxed for 10 minutes. The soHd is filtered from the hot solution and washed with two 50-ml. portions of ethanol and five 50-ml. portions of diethyl ether. The yield is 12.2 g. (89%) (checkers report 97% yield) of diamagnetic gray-green prisms, m.p. 190 to 198° with decomposition (checkers report 195°), soluble in benzene, chloroform, and dichloro-methane, and insoluble in light petroleum, carbon tetrachloride, and ethanol. Anal. Calcd. for ReOCl2(OEt)-2P — (C H6)3 Cl, 8.4 Re, 22.1. Found (by checkers) Cl, 8.1 Re, 21.4. 

EMIRS studies of ethanol on platinum electrodes have demonstrated the presence of linearly bonded carbon monoxide on the surface [106]. An important problem in the use of EMIRS to study alcohol adsorption is the choice of a potential window where the modulation is appropriate without producing faradaic reactions involving soluble products. Ethanol is reduced to ethane and methane at potentials below 0.2 V [98, 107] and it is oxidized to acetaldehyde at c 0.35 V. Accordingly, a potential modulation would be possible only within these two limits. Outside these potential region, soluble products and their own adsorbed species complicate the interpretation of the spectra. The problem is more serious when the adsorbate band frequencies are almost independent of potential. In this case, the potential window (0.2-0.35 V) is too narrow to obtain an appropriate band shift and spectral features can be lost in the difference spectrum. 

Tokunaga, J. Kawai, M. Solubilities of methane in methanol-water and ethanol—water solutions. J. Chem. Eng. Jpn. 1975, 8, 326-327. 

Solubility miscible with benzene, chloroform, dichloro-methane, ether, and hexane practically insoluble in ethanol (95%) and water. 

Solubility soluble in cold water, forming a viscous colloidal solution practically insoluble in chloroform, ethanol (95%), and ether, but soluble in mixtures of ethanol and dichloromethane, mixtures of methanol and dichloro-methane, and mixtures of water and alcohol. Certain grades of hypromellose are soluble in aqueous acetone solutions, mixtures of dichloromethane and propan-2-ol, and other organic solvents. See also Section 11. 

Curcumin is not water-soluble, but it is soluble in ethanol or in dimethylsulfoxide. The degradation kinetics of curcumin under various pH conditions and the stability of curcumin in physiological matrices have been established. When curcumin was incubated in O. IM phosphate buffer and semm-free medium (pH 7.2 at 37°C), about 90% decomposed within 30min. A series of pH conditions ranging from 3 to 10 were tested, and the results showed that decomposition was pH-dependent and occurred faster at neutral-basic conditions. It is more stable in cell culture medium containing 10% fetal calf seram and in human blood. Less than 20% of curcumin decomposed within Ih, and after incubation for 8h, about 50% of curcumin still remained. Trans-6-(4 -hydroxy-3 -methoxyphenyl)-2,4-dioxo-5-hexenal was predicted to be the major degradation product, and vanillin, feralic acid, and feraloyl methane were identified as minor degradation products. The amount of vanillin increased with incubation time. 

In general, the oxazocines display typical solubility behavior, dissolving readily in chlorinated methanes, with CDCI3 the near-universal solvent of choice for NMR spectral studies, and, frequently, in methanol or ethanol as well //-bonding may well facilitate dissolution in the latter solvents. Dione (72) appears to be rather less soluble, as evidenced by the use of DMSO for C NMR spectroscopy <85JOUi769>. Lower solubility is apparent in hydrocarbon solvents, although a variety of oxazocines have been successfully recrystallized from low-boiling petroleum ether... 

Solubility diazomethane is most often used as prepared in ether, or in ether containing a small amount of ethanol. It is less frequently prepared and used in other solvents such as dichloro-methane. 

The low solubility of hydrocarbons in water has led to the concept of hydrophobic solute methane molecules, given the opportunity to distribute between water and, say, ethanol, will prefer the latter. The term phobia is not really... 

Figure 9. Pure gas propane permeability and propane/methane selectivity for a series of selected organic liquids (O), rubbery siloxane-based polymers ( ), and glassy polymers ( ). The glassy polymers include PI, a polyimide (79), PC, polycarbonate (80), PS, polystyrene (81), and PTMSP (82), Data for the siloxane-based rubber polymers are from Stem et al (83), The solubility of propane and methane in selected organic liquids (hexane, heptane, octane, acetone, benzene, methanol, and ethanol) is from the compilation by Fogg and Gerrard (72). Diffusion coefficients of propane and methane in these liquids were estimated using the Tyn and Calus correlation (46 48),...

The complex forms orange crystals mp 130-133° (dec., sealed tube) (checker 134-136°) which are stable in air for prolonged periods. It is insoluble in light petroleum and water, slightly soluble in cold methanol or ethanol, diethyl ether, or cyclohexane, more soluble in chloroform, carbon tetrachloride, dichloro-methane, carbon disulfide, and acetone, and very soluble in benzene, acetonitrile, and nitromethane. The H nmr spectrum contains a sharp singlet at T 5.99 for the CsHs protons and a broad signal at t 2.84 for the aromatic protons (in CDCls solution). 

White to yellowish crystal mass, easily soluble in water, ethanol, soluble in ether and dichloro-methane. 

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