Diethyl ether, sulfide

The stability of the various cumulenic anions depends to a large extent upon the nature of the groups linked to the cumulenic system. Whereas solutions of lithiated allenic ethers and sulfides in diethyl ether or THF can be kept for a limited period at about O C, the lithiated hydrocarbons LiCH=C=CH-R are transformed into the isomeric lithium acetylides at temperatures above about -20 C, probably via HC C-C(Li )R R Lithiated 1,2,4-trienes, LiCH=C=C-C=C-, are... 

Hate 3. All glassware used for the work-up and distillation must be rinsed with a dilute solution of triethylamine in diethyl ether or acetone in order to be sure that traces of acids on the glass walls have been neutralized. Allenic sulfides with the structure C=C=C(SR)-CH- isomerize under the influence of acids to give conjugated dienes, C=C-C(SR)=C. 

The products are Hquids, soluble in various solvents and stable over prolonged periods. Monochloroborane is an equiUbtium mixture containing small amounts of borane and dichloroborane complexes with dimethyl sulfide (81). Monobromoborane—dimethyl sulfide complex shows high purity (82,83). Solutions of monochloroborane in tetrahydrofuran and diethyl ether can also be prepared. Strong complexation renders hydroboration with monochloroborane in tetrahydrofuran sluggish and inconvenient. Monochloroborane solutions in less complexing diethyl ether, an equiUbtium with small amounts of borane and dichloroborane, show excellent reactivity (88,89). Monochloroborane—diethyl etherate [36594-41-9] (10) may be represented as H2BCI O... 

Although dichloroborane reacts direcdy with alkenes in the gas phase (118), its complexes with diethyl ether and dimethyl sulfide are so strong that direct hydroboration does not proceed (119,120). The addition of a decomplexing agent, eg, boron trichloride, is necessary for hydroboration. 

For example, carbon dioxide from air or ethene nitrogen oxides from nitrogen methanol from diethyl ether. In general, carbon dioxide, carbon monoxide, ammonia, hydrogen sulfide, mercaptans, ethane, ethene, acetylene (ethyne), propane and propylene are readily removed at 25°. In mixtures of gases, the more polar ones are preferentially adsorbed). 

This dialkoxydiphenylsulfurane has been prepared by the reaction of diphenyl sulfide, 2,2,2-trifluoro-l-phenyl-l-(trifluoromethyl)ethyl hypochlorite, and potassium l,l,l,3,3,3-hexafluoro-2-phenyl-2-propanolate and by the reaction of diphenyl sulfide with 1 equivalent of chlorine and 2 equivalents of potassium 1,1,1,3,3,3-hexafluoro-2-phenyl-2-propanolate in diethyl ether. ... 

Early efforts to effect the photoinduced ring expansion of aryl azides to 3H-azepines in the presence of other nucleophiles met with only limited success. For example, irradiation of phenyl azide in hydrogen sulfide-diethyl ether, or in methanol, gave 17/-azepine-2(3//)-thione35 (5% mp 106—107 " O and 2-methoxy-3//-azepine (11 %),2 3 respectively. Later workers194 failed to reproduce this latter result, but found that in strongly basic media (3 M potassium hydroxide in methanol/dioxane) and in the presence of 18-crown-6, 17/-azepin-2(3//)-one was produced in 48% yield. In the absence of the crown ether the yield of azepinone falls to 35%. 

Bis(2-chloroethylthio)diethyl Ether 2,2/-Dibromodiethyl Sulfide 2,2/-Dichloro-2"-fluorotriethylamine 2,2/-Dichloroethyl Sulfide... 

Sulfides Sulfur Sulfur dioxide Sulfuric acid Sulfuryl dichloride Acids, powerful oxidizers, moisture Oxidizing materials, halogens Halogens, metal oxides, polymeric tubing, potassium chlorate, sodium hydride Chlorates, metals, HC1, organic materials, perchlorates, permanganates, water Alkalis, diethyl ether, dimethylsulfoxide, dinitrogen tetroxide, lead dioxide, phosphorus... 

After being stirred for 2 hours at room temperature, 10 M borane-dimethyl-sulfide complex (2.0 mL) was added. The mixture was heated under reflux for 65 hours. The resulting mixture was cooled to room temperature and cautiously transferred into 2N hydrochloric acid (10 mL) in a 200 mL round-bottomed flask equipped with a magnetic stirrer bar using diethyl ether (10 mL). 

The beneficial effect of added phosphine on the chemo- and stereoselectivity of the Sn2 substitution of propargyl oxiranes is demonstrated in the reaction of substrate 27 with lithium dimethylcyanocuprate in diethyl ether (Scheme 2.9). In the absence of the phosphine ligand, reduction of the substrate prevailed and attempts to shift the product ratio in favor of 29 by addition of methyl iodide (which should alkylate the presumable intermediate 24 [8k]) had almost no effect. In contrast, the desired substitution product 29 was formed with good chemo- and anti-stereoselectivity when tri-n-butylphosphine was present in the reaction mixture [25, 31]. Interestingly, this effect is strongly solvent dependent, since a complex product mixture was formed when THF was used instead of diethyl ether. With sulfur-containing copper sources such as copper bromide-dimethyl sulfide complex or copper 2-thiophenecarboxylate, however, addition of the phosphine caused the opposite effect, i.e. exclusive formation of the reduced allene 28. Hence the course and outcome of the SN2 substitution show a rather complex dependence on the reaction partners and conditions, which needs to be further elucidated. 

Cyanogen chloride Cyclohexane Diethyl ether Dimethyl formaldehyde Dimethyl sulfate Dimethyl sulfide Epichlorohydrin Ethyl acetate Ethyl benzene Ethylene glycol Fluorine... 

Khomane RB, Manna A, Mandate AB, Kulkarni BD (2002) Synthesis and characterization of dodecanethiol-capped cadmimn sulfide nanoparticles in a Winsor II microemulsion of diethyl ether/AOT/water. Langmuir 18 8237-8240... 

TAT, Nitric acid. Phosphorus pentoxide Resorcinol, Nitric acid. Sodium nitrite. Sulfuric acid Resorcinol, Nitric acid. Sodium nitrite Diethyl ether, Dichloromethylphosphine, Ethyl alcohol, N,N-Diethylamine, 2-Ethylthioethanol, Rhombic sulfur Ethylene Chlorohydrin, Sodium sulfide, Nonahydrate, Hydrochloric acid... 

The procedure is very easy to reproduce and the asymmetric sulfoxidation may be applied to a relatively large range of aryl methyl sulfides (Table 9.7). Remarkable features are (i) easy isolation of the enantioenriched products from the catalyst by simple diethyl ether/water-SDS two phase separation (ii) use of green and... 

It has been suggested that the addition of thiols to bicyclobutanes proceeds via a radical chain mechanism to give cyclobutyl sulfides.35 37 Using this procedure, thiols react with tricy-clo[4.1.0.02 7]heptane in either pentane or diethyl ether to give 6-alkylsulfanylbicyclo[3.1.1]-heptanes 20.35... 

Fluoromalonates can be obtained in moderate yields by fluorination of the corresponding carbanions with xenon difluoride, dimethyl sulfide and boron trifluoride-diethyl ether complex.29... 

Swern oxidations have been performed using the PEG2000 bound sulfoxide 34 as a dimethylsulfoxide (DMSO) substitute (reaction 13).49-50 Several alcohols were efficiently oxidized to their aldehydes or ketones using this reagent, oxalyl chloride, and triethylamine. Precipitation of the polymer with cold diethyl ether and filtration through a pad of silica afforded the desired oxidized products in very good yields and purities. The reduced sulfide polymer could be reoxidized to sulfoxide 34 with sodium metaperiodate and used again in reactions with no appreciable loss in oxidation capacity. 

Di-S-ethers of 3,5-dimercapto-l,2,4-thiadiazole are generally very stable and can be steam-distilled. The weakly basic diethyl ether is dealkylated by alcoholic potassium hydrogen sulfide, but resists attack by alcoholic ammonia at 200°. Hydrogen chloride under pressure causes complete degradation.144... 

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