Copper complexes acetylacetone

In chelation complexes (sometimes called inner complexes when uncharged) the central metal ion coordinates with a polyfunctional organic base to form a stable ring compound, e.g. copper(II) acetylacetonate or iron(III) cupferrate ... 

Copper complexes, 5,533-750 acetylacetone hydrolysis, 2,379 photoreduction, 2.384 amidines... 

The colorless, diamagnetic copper(I) complex Cu(acac)(CNPh)2 is formed from copper(I) acetylacetonate and phenyl isocyanide (103). The copper(I) complex (CuCl)2(CNCjH,)2pip was isolated (124) it decomposes to C5H, oNCH=NCgH 11. Primarily on this basis, copper(I) complexes are presumed to be intermediates in various -addition reactions to isocyanides (Section III,D). 

Copper (II) -acetylacetonate complex (Resonating ring compound)... 

The electrophilic substitution of P-diketonate complexes appears to occur as for arenes, and a process involving initial coordination of the electrophile, followed by an intramolecular group transfer, has not been observed, although it has been postulated for the reaction of copper(II) acetylacetonate with thioacetals (equation 14).31... 

Metal acetylacetonates quench triplet species generated by flash photolysis of aromatic ketones and hydrocarbons.330-333 More recently, these reactions have been studied from a synthetic standpoint. Triplet state benzophenone sensitizes photoreduction of Cu(MeCOCHCOMe)2 by alcohols to give black, presumably polymeric, [Cu(MeCOCHCOMe)] . This reacts with Lewis bases to provide complexes of the type CuL2(MeCOCHCOMe) (L = bipyridyl/2, ethylenediamine/2, carbon monoxide, Ph3P). Disubstituted alkynes yield Cu(C2 R2 XMeCOCHCOMe) but terminal alkynes form CuQR acetylides.334 The bipyridyl complex of copper(I) acetylacetonate catalyzes the reduction of oxygen to water and the oxidation of primary and secondary alcohols to aldehydes and ketones.335... 

Pinacolone, o-(diphenylphosphino)benzoyl-coordination chemistry, 401 Piperidine, IV-hydroxy-metal complexes, 797 pA a values azole ligands, 77 Plant roots amino acids, 962 carboxylic acids, 962 Plastocyanin copper binding site, 557 copper(II) complexes, 772 copper(II) site in, 770 Platinum, dichlorobis(benzonitrile)-IR spectrum, 264 Platinum, cis-dichlorodianunine-antitumor activity, 34, 979 Platinum, ethylenebis(triphenylphosphine)-reactions with 5,6-dimethyl-2,l,3-benzothiadiazole, 194 Platinum blue formation, 265 Platinum complexes acetylacetone reactions, 380 amides, 491 amidines... 

A large class of coordination compounds, metal chelates, is represented in relation to microwave treatment by a relatively small number of reported data, mainly p-diketonates. Thus, volatile copper) II) acetylacetonate was used for the preparation of copper thin films in Ar — H2 atmosphere at ambient temperature by microwave plasma-enhanced chemical vapor deposition (CVD) [735a]. The formed pure copper films with a resistance of 2 3 pS2 cm were deposited on Si substrates. It is noted that oxygen atoms were never detected in the deposited material since Cu — O intramolecular bonds are totally broken by microwave plasma-assisted decomposition of the copper complex. Another acetylacetonate, Zr(acac)4, was prepared from its hydrate Zr(acac)4 10H2O by microwave dehydration of the latter [726]. It is shown [704] that microwave treatment is an effective dehydration technique for various compounds and materials. Use of microwave irradiation in the synthesis of some transition metal phthalocyanines is reported in Sec. 5.1.1. Their relatives - porphyrins - were also obtained in this way [735b]. 

The synthesis of arsonium ylides 384 from diazocyclopentadienes 383 and tri-phenylarsine has been reexamined with respect to the efficiency of various copper-containing catalysts Whereas copper bronze gave only ca. 55 % of ylide, yields over 80% were provided by the use of Ou(II) complexes of p-diketonates derived from acetylacetone, 3-methylacetylacetone, benzoylacetone or dibenzoylmethane, as well as by bis[4-(phenylimino)-2-pentanonato-N,0-]copper(II) and Cu(II) acetate, all used in boiling benzene. The sterically more demanding complex bis(dipivaloyl-methanato)copper(II) as well as dichlorodipyridinecopper(II) proved less efficient. CopperfTI) tartrate, the dibenzo-14-crown 6/copper complex and furthermore the acetylacetonate complexes of Co, Ni, Pt and Zn were totally ineffective. When 383a was decomposed by Cu(acac)2 in the presence of pyridine or thioanisole. 

The decomposition rate constant kd for pure benzoyl peroxide in styrene polymerizations is 1.33x10" s at 90°C, while that for the benzoyl peroxide-N,N-diethylaniline redox system is 1.25x10" L/mol-s at 60°C and 2.29x10" L/mol-s at 30°C [15]. The redox system thus has a much larger decomposition rate. Peroxide decomposition is also accelerated in the presence of transition metal ion complexes such as copper (II) acetylacetonate and ammonium salts [17,18]. 

The first report of a coordinated acetylacetone reaction was the bromination of the chromium(III) complex (equation 55). This was followed, more than 30 years later, by the nitration of copper(II) acetylacetonate with dinitrogen tetroxide (equation This result is... 

The interaction between acetone and acetic anhydride yields acetylacetone in the presence of boron trifluoride which acts as an acylation catalyst and acetic acid is obtained as a by product. Acetylacetone is precipitated as its corresponding copper-complex by the addition of cupric acetate solution. Subsequently, acetylacetone is regenerated by treatment with diluted sulphuric acid and extracted successively with solvent ether. 

Precipitate the copper complex of acetylacetone by adding 75 ml of the hot cupric acetate solution to the first collected portion of the steam-distillate 45 ml to the second and 30 ml to the third portion. Allow the three separate flasks labelled, I, II and III, preferably kept overnight in the ice-chest. 

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