Diethyl ether refractive index

Water hydrolyzes diethyl phosphorochloridate [chloro-diethoxyphosphorus(V) oxide] readily but does not affect the diene. Alternatively, the reaction mixture can be processed by fractionation. Evaporation of the petroleum ether and fractionation of the residue through a 25-cm. x 2.2-cm. column of glass helices yields 170 g. (98.5%) of diethyl phosphorochloridate, b.p. 34-36°/0.2 mm., d 1.4210-1.4250 (the refractive index indicates that it contains 5-10% of the title compound), and 240-255 g. (90-96%) of l,2,3,4,5-pentachloro-5-ethylcyclo-pentadiene, b.p. 51-53°/0.2 mm., 1.5398. 

Solvent — The transition energy responsible for the main absorption band is dependent on the refractive index of the solvent, the transition energy being lower as the refractive index of the solvent increases. In other words, the values are similar in petroleum ether, hexane, and diethyl ether and much higher in benzene, toluene, and chlorinated solvents. Therefore, for comparison of the UV-Vis spectrum features, the same solvent should be used to obtain all carotenoid data. In addition, because of this solvent effect, special care should be taken when information about a chromophore is taken from a UV-Vis spectrum measured online by a PDA detector during HPLC analysis. 

The evaporation flask is now removed from the flash evaporator, and the residue (which may appear to be dry) is extracted under nitrogen or helium with three 25-ml. portions of anhydrous, peroxide-free diethyl ether. The ether extract is poured through a medium sintered-glass frit under an atmosphere of nitrogen or helium. Finally, the ether is removed by pumping on the filtered extract at 0°C. for 30-40 minutes. A pressure of less than 1 mm. is maintained. The colorless liquid product is identified as tri-n-butyltin hydride from its liquid-phase infrared spectrum11 and refractive index, n 1.4715, literature, 1.4711 (extrapolated from f> 1.472612 and 1.47206). The yield is 16.5 g. (0.057 mole, 96%). 

The second system investigated 101) (polystyrene macromonomer and perfluoro-alkyl acrylate) is also of great interest. The polymerization is carried out in trifluoro-benzene with AIBN as the initiator to a conversion of the order of 60 %. The graft copolymer formed is soluble in a number of solvents in which the poly(perfluoro-alkyl acrylate) backbone would be insoluble, e.g. in THF and diethyl ether. The easy formation of foams indicates the low surface energy which is characteristic of fluorinated polymers. Double-detection GPC (UV and refractive index) showed that the distribution of polystyrene branches within the sample was quite uniform. 

Mercury diethyl is a liquid of penetrating odour and appreciably volatile at ordinarj temperature. It boils at 159° G., has a density of 2 42346 at 23-2° C. and is readily soluble in ether, less soluble in alcohol, and insoluble in water. The following physical constants have been determined Refractive index, UHa 1 53519 no 1 53990 1 56240... 

Acid number Hydroxyl number Saponification number Refractive index, nj (super-cooled) Flash point, Cleveland Open Cup, F. Fire point, Cleveland Open Cup, "F. Solubility, 25°C., wt. % in water water in in methanol in ethanol in diethyl ether in VM P naphtha in benzene in acetone... 

Fig. 20.1 Analytical separation of the reaction mixture. Conditions sample, 20pi solution in mobile phase column, 25cm x 3.2 mm i.d. stationary phase, LiChrosorb Si 60, 5 pm mobile phase, 1 ml min pentane-diethyl ether (95 5) refractive index detector.

Analytical conditions A solid-phase extraction silica cartridge is used to separate the nonpolar components by elution with petroleum ether diethyl ether (90 10) and the polar components with diethyl ether. The polar components are resolved by HPSEC on 2 columns in series of highly cross-hnked styrenedivinylbenzene copolymers, using tetrahydrofuran as mobile phase and a refractive index detector. 

Accordingly, a linear relationship between dv and (D —l)/(D + 2) in different constitutions of the mixture is expected. The slope of the line is equal to the value of C and from C one obtains the dipole moment in the excited state, For this purpose, diethyl ether and acetonitrile were selected. Their refractive indexes are almost identical, 1.356 and 1.344, respectively however, the dielectric constants are 4.3 for diethyl ether and 37.5 for acetonitrile - a wide difference. 

To a solution (note 2) of 2 g of copper(I) chloride (commercial product) and 4 g of dry lithium chloride (note 3) in 15 g of dry THF was added with swirling 10 g of the acetylenic chloride. The refractive index np (note 4) of the solution rose during 40 min of warming at 40°C from the initial value of 1.487 to a maximum of 1.505. The solution was poured into 100 ml of 4N hydrochloric acid and, after vigorous shaking, the product was extracted with a 1 1 mixture of diethyl ether... 

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