Acety lacetonate

These transformations are analogous to those observed in the reaction of acety-lacetone with 1,3-diaminopropane (77ZC216) and formally fit decomposition of the corresponding /3-diketone derivatives. 

Another example of resonance stabilization of the conjugate base after proton removal is that of acety-lacetone (2,4-pentadione), which undergoes the tautomerization reaction... 

Other methods reported for the determination of beryllium include UV-visible spectrophotometry [80,81,83], gas chromatography (GC) [82], flame atomic absorption spectrometry (AAS) [84-88] and graphite furnace (GF) AAS [89-96]. The ligand acetylacetone (acac) reacts with beryllium to form a beryllium-acac complex, and has been extensively used as an extracting reagent of beryllium. Indeed, the solvent extraction of beryllium as the acety-lacetonate complex in the presence of EDTA has been used as a pretreatment method prior to atomic absorption spectrometry [85-87]. Less than 1 p,g of beryllium can be separated from milligram levels of iron, aluminium, chromium, zinc, copper, manganese, silver, selenium, and uranium by this method. See also Sect. 5.74.9. 

Yoda [28] investigated the activity of 20 catalysts in the transesterification reaction of PET and poly(ethylene isophthalate) (PEI) and found the same order of reactivity as for the transesterification of DMT with EG. The most effective catalysts were the acetates of Zn, Pb(n) and Hg(n), together with Co(m) acety-lacetonate and Sb203. Titanium catalysts were not included in Yoda s study, but are known to be effective catalysts in PET blending [46],... 

By treating the 1,3-dicarbonyl compound acety-lacetone with methyl iodide in the presence of potassium carbonate, one observes alkylation at the central carbon. 

Papai et al. selected as model reaction the addition of 2,4-pentanedione (acety-lacetone) to trans-(H)-nitrostyrene, catalyzed by the bifunctional thiourea catalyst as shown in Scheme 3.6 [32]. The analogous Michael addition involving dimethyl malonate and nitroethylene as substrates, and a simplified catalyst was calculated at the same level of theory by Liu et al. [33]. Himo et al. performed a density functional study on the related cinchona-thiourea catalyzed Henry-reaction between nitromethane and benzaldehyde [34]. 

Kotchevar, A.T., P. Ghosh, D.D. DuMez, and F.M. Uckun. 2001. Induction of aerobic peroxidation of liposomal membranes by bis(cyclopentadienyl)-vanadium(IV) (acety-lacetonate) complexes. J. Inorg. Biochem. 83 151-160. 

Figure 4.10 Oxidation (solid line) vs spin conversion (broken line). Cr(III) acety-lacetonate in benzene, 353 K.

The camphor-derived tridentate amino alcohol 32 (Scheme 17) also catalyzes the conjugate addition reaction of diethylzinc in the presence of nickel acetylac-etonate to afford the product in 83% ee [75]. Similarly the Hgand 33-cobalt acety-lacetonate complex catalyzes the reaction to afford the product in 83% ee [76]. 

Si NMR of hexamethyldisiloxane has been examined using a 750-MHz resonance frequency, and a number of technical issues discussed (Knight and Kinrade 1999) the use of chromium111 acety-lacetonate to reduce the 29Si relaxation time and of a DEPT-45 pulse sequence. 

EDTA. The bidentate figands ethylenediamine, oxalate anion, and acety-lacetonate anion form chelate complexes of enhanced stabifity, dne to the formation of inflexible five- or six-membered rings with the metal. 

Dianisilnitroxyl Cu(CH3COO)2 Mn( CHCOO)3 Cu( acety lacetone )2 Cu-porfirine... 

CgH,)gPNi(C0)2 l(CgH,0)gPhNi(C0)2 Ni-acety lacetonate (CHgC00)2Ni Ni-2-ethy l-hexanoate NiSO ... 

Iridium Complexes. PVK can be doped with a phosphine cyano iridium(in) complex. The complex shows a blue emission at both 467 and 496 nm caused by triplet transitions of states built between metal and ligand and those built in the ligand only [118]. An iridium complex with the ligands of NjS[-C A-tert-butylphenyl)-4-(2-pyridyl) phenylamine and acety-lacetone shows green phosphorescence at 533 nm in a blend of PVK and PBD [119]. A maximum external... 

Kurosawa has shown that the related palladium(II) olefin complex [( ti -C5H5)Pd(Ph3P) (CHj=CHj)] undergoes clean trans attack by both methoxide and the anion of acety-lacetone. These examples of additions to iron- and palladium-olefin complexes occur by attack only at the ligand and lead to stable o-alkyl products because the metal center is coordinatively saturated. This coordinative saturation disfavors attack at the metal that would lead to either products from syn addition or displacement of the olefin. The cr-alkyl complexes that are products of these examples of nucleophilic attack are stable because the most common mode for decomposition of o-alkyl complexes, 3-hydrogen elimination, requires the presence of a vacant coordination site cis to the alkyl group, as noted in Chapters 8 and 9. Such a site is not present in these cr-alkyl products. 

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