Copper acetate reagent

Does HCN actually exist in Odontosyllis enopla as an activator of luminescence Its existence appears likely based on the following two observations. (1) Using benzidine-copper acetate reagent (Feigl, 1960), a faint positive response of HCN was obtained from... 

Barfoed s reagent Is prepared by dissolving 13-3 g. of crystallised neutral copper acetate in 200 ml. of 1 per cent, acetic acid solution. The reagent does not keep well. 

Cupric acetate solution. Dissolve 400 mg cupric acetate in 250 mL of ethanol. Dilute 25 mL of this solution to 100 mL with ethanol Color reagent solution. Mix 400 mL of ethanol with 120 mL of copper acetate solution and 100 mL of diethanolamine in a 1000-mL volumetric flask. After dissolution, adjust the volume to 1000 mL with ethanol... 

Several techniques have been used to activate the zinc metal and improve yields. For example, pretreatment of zinc dust with a solution of copper acetate gives a more reactive zinc-copper couple.168 Exposure to trimethylsilyl chloride also activates the zinc.169 Wilkinson s catalyst, RhCl(PPh3)3 catalyzes formation of Reformatsky reagents from diethylzinc, and reaction occurs under very mild conditions.170... 

Prepare 50 cc. of a solution of copper acetate saturated at room temperature. Prepare also a solution of ammonia by diluting the concentrated reagent with an equal volume of water. 

Published methods for decarboxylation of indole-2-carboxylic acid to form indole include pyrolysis or heating with copper-bronze powder, cop-per(I) chloride, copper chromite, copper acetate or copper(II) oxide, in for example, heat-transfer oils, glycerol, quinoline or 2-benzylpyridine. Decomposition of the product during lengthy thermolysis or purification affects the yields. From the perspective of green and sustainable chemistry, these methods have disadvantages associated with the choice of media and reagents as well as with the yields. Quite remarkably, however, in water at 255 °C, decarboxylation was quantitative within 20 min (Scheme 20) [77]. 

The rest of the synthesis (Scheme 13) is completely stereospecific and most of the steps are known (20). The bicyclic acid was oxidatively decarboxylated with lead tetraacetate and copper acetate (21). The resulting enone was alkylated with methyllithium giving a single crystalline allylic tertiary alcohol. This compound was cleaved with osmium tetroxide and sodium periodate. Inverse addition of the Wittig reagent effected methylenation in 85% yield. Finally, the acid was reduced with lithium aluminum hydride to grandisol. 

Copper acetate-benzidine acetate test (DANGER THE REAGENT IS CARCINOGENIC.) This reaction takes place because the oxidation-reduction potential of the copper(II)-copper(I) couple is increased if copper(I) ions are removed by cyanide ions. 

Mix a few drops of the test solution with a little dilute sulphuric acid in a micro test-tube and tie (or otherwise fix) a piece of drop-reaction paper which has been moistened with a mixture of equal parts of the copper acetate and benzidine reagents to the top of the tube. A blue colouration is produced. 

The copper(II) acetate reagent (solution I) is a 3 per cent solution of copper(II) acetate in water. 

Another widely used decarboxylation procedure involves the use of lead tetraacetate. Depending on the nature of the substrate and the reaction conditions, this reagent may transform a carboxylic acid into an alkane or alkene, or into the respective acetoxy derivative (Scheme 2.144). The most favorable conditions for alkane formation utilize a good hydrogen donor as the solvent. Usually this transformation is carried out as a photochemically induced oxidative decarboxylation in chloroform solution, as is exemplified in the conversion of cyclobutanecarboxylic acid in cyclobutane.In contrast, the predominant formation of alkenes occurs in the presence of co-oxidants such as copper acetate. ... 

Ullmann reaction Copper bronze. Copper powder. Cuprous oxide. Tetramethylurea. Vinyl ester interchange Vinyl acetate (reagent). Mercuric acetate (catalyst). 

Barfoed s reagent. Aqueous solution of copper acetate. 

C. (E)-2-(4-Hydroxy-6-phenyl-5-hexenyl)-1H-lsolndole-1,3(2H)-dione 4. The THF solution of the copper-zinc reagent is cooled to -78°C and 19.9 mL (162 mmol) of boron trifluoride etherate (Note 13) is added dropwise. The reaction mixture is warmed to -30 C and stirred for 30 min, then cooled to -60°C. (E)-Cinnamaldehyde (5.71 g, 43.2 mmol) is added slowly via a syringe. The reaction mixture is allowed to stir at -30 C for 14 hr (Note 14) and for 30 min at 0°C. After this time, conversion is complete as Indicated by GLC analysis and the reaction mixture is poured into an Erlenmeyer flask containing 500 mL of ethyl acetate, 100 mL of a saturated aqueous... 

Preparation. The reagent is prepared by the reaction of paraformaldehyde and diethyl malonate in glacial acetic acid catalyzed by copper acetate and potassium acetate (yield 46%).1 It is obtained as an oil which polymerizes at room temperature to a wax. The monomer can be recovered by distillation in vacuum. 

To identify acrylonitrile polymers, take a sample of the material and add a small amount of zinc dust and a few drops of 25% sulfuric acid (1 ml concentrated sulfuric acid added to 3 ml water, slowly). Heat this mixture in a porcelain crucible. Cover the crucible with filter paper moistened with the following reagent solution Dissolve 2.86 g copper acetate in 1.0 liter water. Then dissolve 14 g benzidine in 100 ml acetic acid, and to 67.5 ml of this... 

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