Copper I acetate

There have been relatively few detailed kinetic studies of the decompositions of metal acetates, which usually react to yield [1046] either metal oxide and acetone or metal and acetic acid (+C02 + H2 + C). Copper(II) acetate resembles the formate in producing a volatile intermediate [copper(I) acetate] [152,1046,1047]. 

Bromonaphthalene has been reduced to naphthalene in good yield by hydrogenation over Raney nickel in methanolic potassium hydroxide, by triphenyltin hydride in benzene, by magnesium in isopropyl alcohol, by sodium hydrazide and hydrazine in ether, and by copper(I) acetate in pyridine. ... 

The thermal decomposition of copper(II) acetate has been proposed by several workers as a useful method for the synthesis of pure copper(I) acetate.1-3 This method, however, suffers from several drawbacks. The major products of the decomposition are copper(I) oxide and acetic acid in contrast, the copper(I) acetate is obtained in low yields (<5%) together with some acetone and carbon... 

All the synthetic methods described above give products that require extensive purification. Moreover, the copper(I) acetate often undergoes rapid oxidation on exposure to the atmosphere because any solvent in contact with the copper(I) acetate absorbs water vapor, which promotes the conversion of copper(I) to copper(II) in air. 

A simple heterogenous gas-phase reaction for the synthesis of extremely pure copper(I) acetate in high yields (50-65%) is described below. No solvents are required in the synthetic procedure and the product is relatively stable in air. 

Copper(I) acetate is a white solid that slowly decomposes in air and is very unstable toward water. The green decomposition product has the molecular formula Cu2(CH3COO)2(OH)2. The far infrared spectrum of copper(I) acetate has bands at 230(s), 255 (s), 375(m), and 419(m) cm 1 that are distinct from those of starting material and decomposition product. The Cu 2Pi/2)3/2 band in the photoelectron spectrum of pure copper (I) acetate exhibits no secondary structure, in contrast to that of copper(II) acetate and the green decomposition product. 

Tris-(2-imidazolidinethione)copper(I) acetate and sulfate have similarly been obtained by reducing the appropriate copper(II) salt with the ligand in water. They are presumably ionic since solutions of the latter gave an immediate precipitate of BaS04 when treated with BaCl2 249). Tris (0-ethylaminothioformate)copper(l) chloride 101, 299) and bromide 299) have been prepared from the copper(I) salts. 

The decomposition of copper(II) acetate (473 to 563 K) is accompanied [32] by significant reactant volatihzation and, as with the formate, a deposit of copper metal is formed on the container walls. Copper(I) acetate was proposed as the mobile intermediate [14,33,34]. 

Chromic anhydride-pyridine, 70 Chromium hexacarbonyl, 71 Chromones, 423 Chromous chloride, 73 Chrysanthemic acid, 49, 50, 207-208 Chrysanthemic esters, 183-184 Cinnamic esters, 362 CitroneUol, 5, 308, 309 Claisen rearrangement, 2, 372 Clemmensen reduction, 426 Cocaine, 384 Codeine, 236, 347, 348 Conjugate addition, 86, 102, 119-120, 133, 226-227, 253, 353, 400 Cope rearrangement, 66, 397 Copper, 73-74 Copper(I) acetate, 80 Copper(II) acetate, 39, 117, 126, 186 Copper(I) bromide-Lithium trimethoxy-aluminum hydride, 80 Copper(I) bromide, 79-80 Copper(I) chloride, 50, 80-81 Copper(II) chloride, 126, 79 Copper(l) cyanoacetate, 74 Copper halide nitrosyls, 73 CopperO) iodide, 81-82 Copper(I) methyltrialkylborates, 4,75 CopperGD perchlorate. 79 COpper(I) phenylacetylide, 237 Copper(II) sulfate, 117 CopperO) trifluoiomethanesulfonate, 75-76... 

Some reactions of copper(I) chloride or copper(I) acetate lead to the formation of copper telluride clusters that contain Te-Te bridges (59-62 see Figure 3.67). 

The reaction of copper(I) acetate with dioxygen in pyridine was found to be faster than that with CuCl and the kinetic order with respect to Cu(I) was 2 [61].This leaves the CuCl/py reaction in a unique position. The mechanistic implications are that the... 

The ability of aqueous copper(I) solutions to absorb alkenes and alkynes is used industrially. In the steam cracking of naphtha into alkenes, which is carried out at 770°C/latm, the main product is ethene. Propene and lesser amounts of alkynes, 1,3-butadiene and butenes are also produced. A chilled aqueous ammoniacal copper(I) acetate solution is used as the absorber. The more unsaturated the hydrocarbon, the more stable is the complex. In the first stage the alkynes combine with copper, the complex is withdrawn and the alkynes liberated by heating. The copper solution is then recycled at a lower temperature to remove the 1,3-butadiene, allowing butanes and butenes to pass on. The 1,3-butadiene is freed by heating the solution of complex in a desorber and is finally fractionated. 

In 400. min, 2.25 g of copper is obtained by electrolysis of a copper(I) acetate solution, (a) How many amperes is required for this experiment (b) Using the same current and time, what mass of copper would be obtained from a copper(II) nitrate solution ... 

Bromocycloheptanone is reduced to cycloheptanone by titanocene dichloride and magnesium. Vinyl acetates, including 1- and 2-acetoxycyclohepta-1,3-dienes, have been prepared from vinyl bromides using copper(i) acetate. a-Formylcyclo-heptanone reacts with 2,2-dimethyl-3-dimethylamino-2ff-azirine to give adduct (320). Electrochemical reduction of some seven-membered cyclic P-diketones has been studied polarographically/ ... 

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