Argon partitioning

Argon partition coefficients for olivine have recently been determined by Brooker et al. (1998). Their measured Z)at values are around 10 , which is higher than measured for clinopyroxene, but similar to the estimated values for orthopyroxene. We propose a value... 

Brooker RA, Wartho J-A, Carroll MR, Kelley SP, Draper DS (1998) Preliminary UVLAMP determinations of argon partition coefficients for olivine and clinopyroxene grown from silicate melts. Chem Geol 147 185-200... 

Brooker R. A., Wartho J.-A., Carroll M. R., Kelley S. P., and Draper D. S. (1998) Prehminary UVLAMP determinations of argon partition coefficients for ohvine and chnopyroxene grown from silicate melts. Chem. Geol. 147, 185—2(X). 

At equilibrium, in order to achieve equality of chemical potentials, not only tire colloid but also tire polymer concentrations in tire different phases are different. We focus here on a theory tliat allows for tliis polymer partitioning [99]. Predictions for two polymer/colloid size ratios are shown in figure C2.6.10. A liquid phase is predicted to occur only when tire range of attractions is not too small compared to tire particle size, 5/a > 0.3. Under tliese conditions a phase behaviour is obtained tliat is similar to tliat of simple liquids, such as argon. Because of tire polymer partitioning, however, tliere is a tliree-phase triangle (ratlier tlian a triple point). For smaller polymer (narrower attractions), tire gas-liquid transition becomes metastable witli respect to tire fluid-crystal transition. These predictions were confinned experimentally [100]. The phase boundaries were predicted semi-quantitatively. 

To a stirred ice-cold soln of thioglycerol (22 10.8 g, 0.1 mmol) and hydrazine 23 (52.0 g, 0.15 mmol) in argon-sat. dioxane[185 was added dropwise 1M NaOH (100 mL). After 2 h at rt, the solvent was removed and the residue was partitioned between EtOAc and 2% KHS04. The organic phase was washed with H20, dried (Na2S04), and concentrated to small volume. The product crystallized upon addition of petroleum ether yield 18g (92%) mp 48.5 19.5 °C. 

For strongly shocked Argon (see Table 1), calculations based on Eq 8 give a s that are 30 to 40% higher than the more accurate (partition function) calculations of Reynolds... 

The mobile phase in vapour phase chromatography is a gas (e.g. hydrogen, helium, nitrogen or argon) and the stationary phase is a non-volatile liquid impregnated onto a porous material. The mixture to be purified is injected into a heated inlet whereby it is vaporised and taken into the column by the carrier gas. It is separated into its components by partition between the liquid on the porous support and the gas. For this reason vapour-phase chromatography is sometimes referred to as gas-liquid chromatography. 

To a solution of 86 (1.25 g, 1.65 mmol) in dry acetonitrile (30 mL) were added the aspartic acid derivative 87 (652 mg, 1.83 mmol) and AF-bromosuccinimide (444 mg, 2.50 mmol). The mixture was stirred in the dark at room temperature under argon. After 1 h, aqueous NajSjOj (10 mL) was added, the bulk of organic solvent was evaporated under reduced pressure, and the residue was partitioned between water (100 mL) and chloroform (100 mL). The aqueous layer was extracted with chloroform (3 x 100 mL). The combined organic layers were washed with water (2 x 75 mL) and dried, and the solvent was removed under reduced pressure. Flash column chromatography (light petroleum-ethyl acetate, 4 1)... 

A solution of 2-(2-amino-5-chlorophenyl)-4-cyclopropyl-l,l,l-trifluoro-3-butyn-2-ol (15.00 g, 0.0518 mol) and 41.98 g (0.259 mol) of 1,1 -carbonyldiimidazole in 250 mL of dry THF was stirred under argon at 55°C for 24 hours. The solvent was removed on a rotary evaporator and the residue was partitioned between 500 mL of ethyl acetate and 400 mL of water. The layers were separated and the aqueous phase was extracted once more with ethyl acetate. The combined ethyl acetate extracts were washed with 2 times 200 mL of 2% aqueous HCI, saturated aqueous NaHC03, and brine. Drying over MgS04, filtration, and removal of the solvent in vacuo provided 16.42 g of the title compound as a solid. Recrystallization from ethyl acetate/hexane afforded 12.97 g of analytically pure ()-6-chloro-4-cyclopropylethynyl-4-trifluoromethyl-l,4-dihydro-2H-3,l-benzoxazin-2-one as a white crystals. Melting point 178°-180°C. 

Separation occurs by distillation, which is the physical partition of compounds by the differences in their boiling points (see Fig. 27.5 below in the section Argon ). The distillation... 

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