Ethers purification

The petroleum ether purification step may be eliminated with equally satisfactory results. After dehydration with ethyl alcohol, the residue is dried under reduced pressure to constant weight and used directly for the next step. 

Oglialoro modification of, 708 Perkin triangle, 108, 218f Kon modification of, 109 Peroxides, detection of, in ether, 163 removal from diethyl ether, 163 removal from isopropyl alcohol, 886 Petroleum ether, purification of, 174 Phenacetin, 996, 997 1 10-Phenanthroline, 991, 992 p-Phenetidine, 997, 998 Phenetole, 665,670 Phenobarbitone, 1003,1004,1005 Phenol, 595, 613 Phenol aldehyde polymers, 1016 formation of, 1022 Phenolphthalein, 984, 985 action as indicator, 984 ... 

Elastomers, see Rubber End-to-end seals glass, 251-253 plastic, 26l, 265 Epoxy resins, 268-269 Esr sample preparation, 190-191 Ethers, purification, 91 Ethylene ... 

Halogenated acyl derivatives of steroids have been applied in order to increase sensitivity of the analysis. It follows from a comparison of the ECD responses of haloacetates of steroids that the highest sensitivity can be obtained with the aid of monochloro-acetates [351]. Brownie et al. [352] applied them in the analysis of testosterone in blood. The method involves the extraction of blood plasma with diethyl ether, purification by TLC and derivatization. GC analysis is performed only after a preliminary separation on a thin layer. Preparation of the derivatives is carried out by treating a dried extract with... 

Minh, L.Q., Long, N.V.D. and Lee, M. (2012) Energy efficiency improvement of dimethyl ether purification process by utilizing dividing wall columns. Korean Journal of Chemical Engineering, 29, 1500-1507. 

After bombardment, the hot central-sphere block was removed and the uranium oxide from one hemisphere was taken out and broken lip in a mortar, dissolved in HNO3, and the ether purification made, as described by Anderson, after which a thick-dish sample was prepared for counting, as in previous work. The cyclotron beam was monitored from run-to-run with (a), two Pbl2 samples placed at 10 cm in the block (at room temperature), (b), with a Pbl2 sample placed on the cyclotron outside the block, and (c), with a thin... 

A sample of 2-ethylnaphthalene was reacted with HFA in the presence of catalytic amounts of AICI3 at 60 °C for 48 h. Volatiles were removed and the products extracted with diethyl ether. Purification of the crude reaction mixture by column chromatography (Si02) with a gradient of acetone (0-30%) in... 

Preparative Methods commercially available or prepared by reacting tert-butylamine with benzenesulfenyl chloride in ether. Purification distillation at 94—95 °C/7 mmHg. 

In both cases, analytically pure material can be obtained by recrystallization of the crude product from ethanol-diethyl ether. Purification 1 recrystaUization from toluene. 2 recrystallization from ethanol-diethyl ether. 

Form Supplied in anhydrous white solid or as the hydrate. Preparative Methods the anhydrous salt of high purity can be prepared from lithium hydride and iodine in ether. Purification crystallized from hot H2O (0.5 mL g ) by cooling in CaCl2-ice or from acetone. Lil is dried for 2 h at 120 °C (0.1 mmHg, P2O5) before use. 

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