Methylation mixed organic carbonates

Scheme 4.23 Methylation of phenols with mixed organic carbonates (ROCO2CH3).

Mixed organic carbonates in which a methyl group is attached to the carbonate as is a much larger organic moiety, R,... 

Kimura and Miller [28] have also studied the decomposition of organic fungicides in soil to mercury vapour and to methyl- or ethylmercury compounds and devised methods for the determination of these compounds in the vapours liberated from the soil sample. The mixed vapours of mercury and organomercury compounds is passed successively through bubblers containing a carbonate-phosphate solution to absorb organic... 

Conversion into 6-methyl-2-(4-methylphenyl)hepta- 1,5-diene. 2- 4-methyl-phenyl)prop-2-enyl vinyl ether. A mixture of the foregoing allylic alcohol (2.5 g), ethyl vinyl ether (75 ml) and freshly crystallised mercury(n) acetate (600 mg) is refluxed continuously for 12 hours on a water bath. The reaction mixture is chilled in ice and mixed with 10 per cent aqueous sodium carbonate solution (25 g) and stirred well for 30 minutes at 0 °C. The organic layer is... 

Amantea and Narang [58] used a reversed-phase HPLC method for the quantitation of omeprazole and its metabolites. Plasma was mixed with the internal standard (the 5-methyl analog of omeprazole), dichlor-omethane, hexane, and 0.1 M carbonate buffer (pH 9.8). After centrifugation, the organic phase was evaporated to dryness and the residue was dissolved in the mobile phase [methanol-acetonitrile-0.025 M phosphate buffer of pH 7.4 (10 2 13)] and subjected to HPLC at 25 °C on a column (15 cm x 4.6 mm) of Beckman Ultrasphere C8 (5 ym) with a guard column (7 cm x 2.2 mm) of Pell C8 (30-40 /im). The mobile phase flow-rate was 1.1 ml/min with detection at 302 nm. The calibration graphs are linear for <200 ng/ml, and the limits of detection were 5, 10, and 7.5 ng/ml for omeprazole, its sulfone, and its sulfide, respectively. The corresponding recoveries were 96.42% and 96% and the coefficients of variation (n = 5 or 6) were 3.0-13.9%. 

Epoxynovolak resin and BPA/DC-BMI prepolymer, tert.butyl peroxide and Zn acetate [106, 107] or 2-phenylimidazole and other catalysts [108] were filled with wollastonite. Carbon-fiber reinforced composites were obtained using a binder, which consisted of BPA/DC, BMI, an epoxynovolak, 2-ethyl-4-methylimidazole and an organic solvent [109]. A BPA/DC-BMI prepolymer in methylethylketone was mixed with middle-molecular-weight epoxide resin (Epikote 1001), 2-ethyl-4-methyl-imidazole, Zn acetate and triethylenediamine thermal shock resistant GRP was thus obtained [110]. 

The specific heat of mixtures of liquids can rarely be calculated additively from the specific heats of the components. There is generally a considerable deviation from the law of mixtures, and the calculated value is always larger than one would expect. Mixtures of hquids which are closely related chemically, such as ethyl and methyl alcohol, chloroform and carbon disulphide, behave normally mixtures of water with alcohol, or of alcohol with other organic hquids, show large deviations. It is noteworthy that heat is evolved on mixing these hquids, an indication that chemical combination also is taking place. This is probably the reason for the alteration in the heat capacity, since the specific heat of liquid chemical compounds cannot be calculated additively from the specific heats of the components. The regularities shown by sohd bodies do not hold even approximately for hquids. 

Coal, Soil Organic Matter and Other Related Materials. - 5.5.1 Coals and Carbonaceous Materials. C - The extract from carbon disulfide/AT-methyl-2-pyrrolidinone mixed solvent extraction of Upper Freeport coal at room temperature has been fractionated with acetone and pyridine into three fractions, and solid-state NMR measurements of these fractions have been measured. 

Methyl alcohol occurs naturally in plants and animals, including humans, as the product of metabolic reactions that occur in all organisms. It also occurs in the atmosphere as the result of the decomposition of dead organisms in the soil. None of these sources is utilized for the commercial production of methyl alcohol. Instead, the primary method for the preparation of methyl alcohol is to react carbon monoxide with water at a temperature of about 25o°C (48o°F) and pressures of 50 to 100 atmospheres over a mixed catalyst of copper, zinc oxide, and aluminum oxide. Efforts are being made to develop other methods of synthesizing methyl alcohol. In one process, for... 

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