Aluminum complexes acetylacetone

Aluminum acetylacetonate, 2 25 Aluminum bromide, 3 30 of high purity, 3 33 Aluminum chloride, compound with selenium(IV) chloride, 5 127 Aluminum complex compounds, anions, oxalato, K3[A1(Cs04)3]-3HsO, 1 36... 

Aluminum, tris (2,4-pentanedionato)- Aluminum, tris (2,4-pentanedionato-0,0 )- Tris (acetylacetonate) aluminum Tris (acetylacetonate) aluminum (III) Tris (acetylacetone) aluminum Tris (acetylacetonyl) aluminum Tris (2,4-pentanedionato) aluminum Tris (2,4-pentanedione) aluminum Definition Aluminum complex of acetylacetone Empiricai C15H21AIO6 Properties Wh. to yel. powd. orcryst. m.w. 

The chelated organic titanates also function as adhesion promoters of the ink binder to printed substrates such as plastic films, paper, and aluminum foil (504). The acetylacetone complexes of titanium are the preferred products for promoting adhesion of printing inks to polypropylene films. 

An obvious method to investigate the formation and the nature of the catalytically active nickel species is to study the nature of products formed in the reaction of complexes such as 3 or 4 with substrate olefins. This has been investigated in some detail in the case of the catalytic dimerization of cyclooctene to 1-cyclooctylcyclooctene (17) and dicy-clooctylidene (18) [Eq. (4)] using as catalyst 7r-allylnickel acetylacetonate (11) or 7r-allylnickel bromide (1) activated by ethylaluminum sesquihalide or aluminum bromide (4). In a typical experiment, 11 in chlorobenzene was activated with excess ethylaluminum sesquichloride cyclooctene was then added at 0°C and the catalytic reaction followed by removing... 

Oxidative addition of the silyl species to nickel is followed by insertion of unsaturated substrates. Zero-valent nickel complexes, and complexes prepared by reducing nickel acetylacetonate with aluminum trialkyls or ethoxydialkyls, and in general Ziegler-Natta-type systems, are effective as catalysts (244, 260-262). Ni(CO)4 is specific for terminal attack of SiHCl3 on styrene (261). 

In the above examples, the nucleophilic role of the metal complex only comes after the formation of a suitable complex as a consequence of the electron-withdrawing effect of the metal. Perhaps the most impressive series of examples of nucleophilic behaviour of complexes is demonstrated by the p-diketone metal complexes. Such complexes undergo many reactions typical of the electrophilic substitution reactions of aromatic compounds. As a result of the lability of these complexes towards acids, care is required when selecting reaction conditions. Despite this restriction, a wide variety of reactions has been shown to occur with numerous p-diketone complexes, especially of chromium(III), cobalt(III) and rhodium(III), but also in certain cases with complexes of beryllium(II), copper(II), iron(III), aluminum(III) and europium(III). Most work has been carried out by Collman and his coworkers and the results have been reviewed.4-29 A brief summary of results is relevant here and the essential reaction is shown in equation (13). It has been clearly demonstrated that reaction does not involve any dissociation, by bromination of the chromium(III) complex in the presence of radioactive acetylacetone. Furthermore, reactions of optically active... 

When zeolite NH4-Na-Y was treated at 400°C under DB conditions a decrease in the number of observable Al atoms was found as the degree of ammonium exchange increased from 0 to 90 %. In the latter case, only ca. of Al present in the zeolite is observed by 27A1 NMR (see Table XIV). The authors estimate vQ > 1.2 MHz for the unobservable Al. However, extralattice Al can be detected by contacting the zeolite with a 38% solution of acetylacetone (Hacac) in ethanol, whereupon mobile Al(acac)3 complexes are formed, and a very narrow 27A1 NMR line results the solution does not affect framework aluminum. It was found that the amount of six-coordinated (i.e., extra-framework) Al increases from 5 % in 84 De Na-Y 300 SB zeolite to 50% in 84 De Na-Y 500 DB zeolite (in this notation the first number refers to the... 

Gava C, Perazzolo M, Zentilin L, et al. 1989b. Genotoxic potentiality and DNA-binding properties of acetylacetone, maltol, and their aluminum(in) and chromium(III) neutral complexes. Toxicol Environ Chem 22 149-157. 

Both di- and trimerization of butadiene with soluble nickel catalysts are well-established homogeneous catalytic reactions. The precatalyst having nickel in the zero oxidation state may be generated in many ways. Reduction of a Ni2+ salt or a coordination complex such as Ni(acac)2 (acac = acetylacetonate) with alkyl aluminum reagent in the presence of butadiene and a suitable tertiary phosphine is the preferred method. The nature of the phosphine ligand plays an important role in determining both the activity and selectivity of the catalytic... 

Tris[as-(diacetyltetracarbonylmanganese)] aluminum is preparedreadily by treating acetylpentacarbonylmanganese with 1 molar-equivalent of methyllithium at 0° followed by the addition of t/a molar-equivalent of anhydrous aluminum chloride. This complex is isostructural with tris(2,4-pentanedionato)aluminum (where 2,4-pentanedione = acetylacetone) except that the methine group is replaced formally by a Mn(C0)4 group, which suggests that the title compound is one example of a metallo-j3-diketonate type complex. 

After extraction from the matrix elements by chloroform of its acetylacetonate, beryllium was separated from co-extracted aluminum by means of a column of the stron y acidic cation-exchanger Dowex 50 Adsorption is affected by tetrahydro-furan-chlorform-methanol-hydrochloric acid medium, elution of aluminum with oxalic acid, and beryllium with 6 M hydrochloric acid. Bismuth was selectively adsorbed in the form of a thiourea complex on a column of a polymer with tri-butylphosphate in the presence of the remaining Fe, Sb, Cu V... 

One of the most versatile classes of ligands in coordination chemistry is that of the /3-diketonates, of which the most common is the acetylacetonate, (acac), Figure 9.1. The coordination chemistry of this ligand first appears in the literature in work by Combes in 1887-1894. Alfred Werner also published on the chemistry of the acac ligand in 1901. The acac ligand is remarkable in that it forms complexes with virtually any metal, including beryllium, lead, aluminum, chromium, platinum, and gadolinium. 

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