Di-ethyl ether

DI-ETHYL ETHER 212-353 -1.110SE402 -1 6936E>03 -8.7474E-02 2.4377E 01 4.031OE-OS... 

CARBON TETRACHLORIDE CARBON TETRACHLORIDE CARBON TETRACH.OR lOE CYCLOHEXANE CYCLOHEXANE CYCLOHEXANE CYCLOHEXANE CYCLOHEXANE 1 2-OlCHLOROETHANE I,2-DICHLORDETHANE 1 (2-DtCHLOROETHANE OI-ETHYL ETHER DI-ETHYL ETHER DI-ETHVL ETHER 01-ETHYL ETHER OI-ETHYL ETHER OI-ETHYL ETHER ETHYL ACETATE ETHYL ACETATE... 

Grignard reagents (Section 14 4) Grignard reagents are prepared in a manner similar to that used for organolithium compounds Di ethyl ether and tetrahydrofuran are appro priate solvents... 

R2 = CH3 (2R,5S)-l-henzoyl-2-lcrt-buty -3,5-dimethyl-4-imida o/idinone yield 85% d.r. 85 15 partial racemization. Enantiomerically pure material is obtained by fractional recrystallization from CH2Cl2/di-ethyl ether at low temperature yield 13% mp 114 117°C [ajj5 —47.7 (c — 1, CHC13)3 R2 = /-Pr (2VL,5S)-l-benzoyl-2-len-butyI-5-isopropyl-3-meth v/-4-itnidazolidinone the product was washed with cold diethyl ether yield 78% d.r. >97 3 partial racemization mp 112°C [a] +24.4 (c = 1.7, CHC13)3... 

Description The Uhde (Edeleanu) technology features a two-stage reactor system of which the first reactor is operated in the recycle mode. With this method, a slight expansion of the catalyst bed is achieved that ensures very uniform concentration profiles in the reactor and, most important, avoids hot spot formation. Undesired side reactions, such as the formation of di-ethyl ether (DEE), are minimized. 

Reiger and Ballschmiter [43] described a multistep method for PCA analysis in sewage sludge by cyclohexane-isopropanol extraction and cleanup on silica gel column chromatography. Fractionation on silica gel was achieved by eluting with hexane (FI), which desorbed hexachlorobenzene, 4,4 -DDE, PCB, PCDD, and PCDF. PCAs were then desorbed from the column with (90 10) hexane/di-ethyl ether. The recovery of PCAs by this method was 86%. These authors also noted that cleanup chromatography on activated alumina should be avoided because PCAs were either totally or partially destroyed by dehydrochlorination during the adsorption process. 

A suspension of activated 3a or 3b (3 g) in toluene (30 cc) was refluxed and stirred in an excess of piperidine (1 g) for 6h. The modified solid 4a or 4b was then washed in succession with water, then with di-ethyl ether-dichloromethane mixture in a soxhlet aparatus overnight. 4b was subsequently washed with ethanol in a soxlhet apparatus overnight leading to 4b. ... 

Transannular cyclization can be induced by acid-mediated activation of a,/J-unsaturated carbonyl groups. Treatment of an a./J-unsaturated ketone with formic acid/boron trifluoridc-di-ethyl ether complex produces the tricycle 1423. Ketone 14 is a precursor in the pentalene 8 synthesis (Prins reaction analog). Transannular Prins cyclizations are described in Section 1.5.5.2.2.2.26-27. 

Place approximately 1-2 g of the hair sample in a teflon beaker, add 100 mL of acetone and stir with a magnetic stirrer for 15 min. Rinse with deionised water and decant. Now add 50 ml of di-ethyl ether and repeat the procedure. Decant, wash with copious flow of distilled water and finally rinse with ultrapure water. Dry the samples in a dust free environment. 

Adsorption chromatography. Separations are usually normal-phase with a silica gel stationary phase and a mobile phase of a nonpolar solvent blended with additions of a more polar solvent to adjust the overall polarity or eluting power, e.g. n-hexane + dichloromethane or di-ethyl ether. The choice of solvent is limited if a UV absorbance detector is to be used. Traces of water in the solvents must be controlled, otherwise solute retention will not be reproducible. Solutes are retained by surface adsorption they compete with solvent molecules for active silanol sites (Si-OH), and are eluted in... 

Murray, R. S. Martin, M. L. Excess Gibbs free energies of di-ethyl ether -l- hexafluorobenzene and diisopropyl ether + hexafluorobenzene at 298.131 K. J. Chem. Thermodyn. 1978, 10, 613-617. 

Various equations for the determination of total chlorophyll and individual amounts of chlorophylls a and b in extracts from plant tissues exist (see Holden 1976) and some of them (e.g. Amon 1949) have been widely used. Additional modifications to the equations have also been developed so as to permit an estimate of total carotenoids to be made from the spectrum of the same mixture in di-ethyl ether (Ziegler, Egle 1965 Gaudillere 1974). 

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