Cyclohexane/methanol

SI Tetrahedral Methane, cyclohexane, methanol, carbon tetrachloride... 

The optimum UNIQUAC interaction parameters between methyl cyclohexane, methanol and ethylbenzene were determined using the experimental liquid-liquid data. The average RMSD value between the observed and calculated mole percents with a reasonable error for these system were methylcyclohexane + methanol + ethylbenzene, in the UNIQUAC model. 

C and 152 C, respectively. They can be isolated in about 15% each. The higher-melting compound proved to be identical with 4-hydroxy-phoq)hinic acid 81a, previously described by Mach p. 55). In cyclohexane/methanol the methyl-ester 81b, also described by, Mach is obtained. 

Apples, pears Homogenized, extraction with chloroform, 0.1 M HC1, neutralized Na2C03, extraction chloroform HPTLC NH2 plates deriva-tized with propylamine, Supelco LC 18 Chloroform-cyclohexane-methanol (6.0 1 0.1), methanol-phosphate buffer (pH 6.6) (56 44) UV 285 nm UV 280 nm 48... 

A Quadruple Point Figure 14.20 shows phase diagrams for (water + acetonitrile) at five different pressures.16 The diagram in (a) at / = 0.1 MPa for this system is very similar to the (cyclohexane + methanol) diagram shown in Figure 14.19a that we described earlier, with a (liquid-I-liquid) equilibrium region present above the (solid + liquid) equilibrium curve for water. 

Taken from K. Roth, G. Schneider, and E. U. Franck, Liquid-Liquid and Liquid-Solid Phase Equilibriums in Cyclohexane-Methanol and Phenol-Water Systems up to 6000 Bars , Ber. Bunsenges. Physik. Chem., 70, 5-10 (1966). 

As an example, Figure 17.15a shows the (liquid + liquid) phase diagram (a system with an UCST) for the (cyclohexane + methanol) system and Figure 17.15b gives <7 , H, and TS for this system at a temperature near, but above, the UCST.24 The arithmetic signs of the results are in agreement with those... 

The (liquid 4- liquid) equilibria diagram for (cyclohexane + methanol) was taken from D. C. Jones and S. Amstell, The Critical Solution Temperature of the System Methyl Alcohol-Cyclohexane as a Means of Detecting and Estimating Water in Methyl Alcohol , J. Chem. Soc., 1930, 1316-1323 (1930). The G results were calculated from the (vapor 4- liquid) results of K. Strubl, V. Svoboda, R. Holub, and J. Pick, Liquid-Vapour Equilibrium. XIV. Isothermal Equilibrium and Calculation of Excess Functions in the Systems Methanol -Cyclohexane and Cyclohexane-Propanol , Collect. Czech. Chem. Commun., 35, 3004-3019 (1970). The results are from M. Dai and J.-P.Chao, Studies on Thermodynamic Properties of Binary Systems Containing Alcohols. II. Excess Enthalpies of C to C5 Normal Alcohols + 1,4-Dioxane , Fluid Phase Equilib., 23, 321-326 (1985). 

It was reported by Ranger that planar chromatography (TLC) can be used for the quantitative analysis of pantoprazole during stability testing [16]. Silica gel was used as a stationary phase, and a 48 35 15 2 mixture of ethyl acetate, cyclohexane, methanol, and concentrated ammonia was used as the mobile phase. Detection was carried out at 295 nm. 

Unfortunately, even using this optimized procedure, we were not able to improve the conversion of primary alcohols into the corresponding aldehydes. However, close examination of the oxidation behavior of several primary aliphatic alcohols revealed intriguing features (Table VII). Whilst poor conversion of 1-decanol 23 to decanal 24 was achieved (Table VII, Entry 1), dibenzyl leucinol 25 and Boc-prolinol 27 were quantitatively transformed into the corresponding aldehydes (Table VII, Entries 2 and 3). The enhanced reactivity of 25 and 27 could be due either to an increased steric effect at the a-carbon center, to an electronic influence of the a-nitrogen substituent or to a combination of both. To test the importance of steric hindrance, the aerobic oxidation of cyclohexane methanol 29 and adamantane methanol 31 was carried out. Much to our surprise, oxidation of 29 afforded 30 in 70% conversion (Table VII, Entry 4) and transformation of 31 to 32 proceeded with 80% conversion (Table VII, Entry 5). Clearly increased substitution at the a-position favors the oxidation of primary aliphatic alcohols, although the conversions are still not optimum. 

The solution was diluted with cyclohexane, a solvent for polystyrene and a nonsolvent for polymethylmethacrylate, and the product thereafter precipitated by addition to methanol THF/cyclohexane/methanol = 1 2 10 (by volume). The product was finally dried to constant weight. 

Platinum catalysts, which usually tend to cause extensive hydrogenolysis, may be used for the selective hydrogenation of benzyl-type alcohols in the presence of a proper base. For example, benzyl alcohol can be hydrogenated to cyclohexane-methanol almost quantitatively over Adams platinum oxide in ethanol with addition of a small amount of acetic acid (eq. 11.36).160... 

The solvents used in this study were, cyclohexane, methanol, n-pentane, and toluene. 

Luo et al. have fabricated a conductive polyurethane/MWNT composite thin film with a selective vapor-induced sensing performance through in-situ dispersion polymerization (120). This kind of thin films yielded higher responsivity to some solvent vapors like benzene, toluene, acetone and chloroform than others such as carbon tetrachloride, cyclohexane, methanol and formaldehyde. 

Figure 7.1 shows a schematic view of laser ablation apparatus in solutions used for the formation of polyynes. Small particles of graphite (Kishida Chem. diameter 75 pm), coal (Indonesian Tanilo I larum or Australian Work-worth), or Cgo (MER corporation) were suspended in a selected solvent. The amount of particles used was 0.05-0.1 g per 10 ml. Elemental analyses of Tanito Harum and Workworth coals showed the following C H N O ratios 71.2 4.4 1.6 21.7% and 79.9 5.6 1.6 12.8%, respectively. As solvents, benzene, toluene, hexane, cyclohexane, methanol, hcxafluorobenzene, perfluorooctane, and perfluorodecaline (Kishida Chem Ind. Tokyo Kasei, or Azmax spectral grade) were used for graphite, hexane was used for coals, and hexane and methanol were employed for Cgg. 

Ethyl acetate cyclohexane-methanol- ammonia 25% (70 15 10 5) Ephedrae herba... 

Decanoate, CjjH FjNjOjS, SQ 10733, QD 10733, Moderate, Prolixin Decanoate. Pale yellow-orange, viscous liquid. Slowly crystallizes at room temp, mp 30-32". Very sol in chloroform, ether, cyclohexane, methanol, ethanol. Insol in water. 

Boric acid is a mild dehydrating agent suitable for removal of water from some primary, secondary, or tertiary alcohols. Since the acid and the alcohol form first a trimeric metaboric ester, which then regenerates the boric acid when it decomposes to the olefin,36 the reaction is somewhat similar to pyrolysis of carboxylic esters but the boric acid dehydration occurs at appreciably lower temperatures (250-300°). Olefins are readily obtained by heating approximately molar equivalents of boric acid and 1-octanol, 1-heptanol, 1-hexanol, (—)-menthol, cyclohexanol, or 5[Pg.817]

X5—Extractable Substances Content. X5 was determined by extraction in a cyclohexane-methanol mixture it is expressed as wt % of the whole ABS. The observed variation range was 1-5.5%. 

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