Palladium acetylacetonate

In the early work on the thermolysis of metal complexes for the synthesis of metal nanoparticles, the precursor carbonyl complex of transition metals, e.g., Co2(CO)8, in organic solvent functions as a metal source of nanoparticles and thermally decomposes in the presence of various polymers to afford polymer-protected metal nanoparticles under relatively mild conditions [1-3]. Particle sizes depend on the kind of polymers, ranging from 5 to >100 nm. The particle size distribution sometimes became wide. Other cobalt, iron [4], nickel [5], rhodium, iridium, rutheniuim, osmium, palladium, and platinum nanoparticles stabilized by polymers have been prepared by similar thermolysis procedures. Besides carbonyl complexes, palladium acetate, palladium acetylacetonate, and platinum acetylac-etonate were also used as a precursor complex in organic solvents like methyl-wo-butylketone [6-9]. These results proposed facile preparative method of metal nanoparticles. However, it may be considered that the size-regulated preparation of metal nanoparticles by thermolysis procedure should be conducted under the limited condition. 

Addition of palladium acetylacetonate in glyme to a cold glyme solution of excess dicarbollide ion produced the air-sensitive (l,2-B9C2Hn)2Pd2 ion (42). Solutions of this ion deposited palladium metal on standing. The Pd(II) compound was oxidized with iodine to produce the neutral species, (l,2-B9C2Hn)2Pd. 

Other palladium acetylacetonate complexes have also been developed for cross-coupling reactions. Indeed, an acac paUadacycle complex has recently been observed to effectively catalyze both the Suzuki-Miyaura and Heck reactions. Likewise, the A-heterocyclic carbene complex Pd(acac)Cl(ipr) (96) is an excellent catalyst for the formation of C—N and C—C bonds (equation 27) These catalysts were effective for coupling of ketones... 

Prepared as described by P. G. Charles and M. D. Pawlikowski in J. Phys. Chem.,62, 440 (1958) for Ni (acac>2. Palladium acetylacetonate and triphenylphosphine were crystallized and stored under argon. 

Palladium nanostructures formed by nanowires, nanoplates or having a flower-like shape were synthesized using y-radiolysis, by the slow reduction of palladium acetylacetonate in propan-2-ol under CO atmosphere.By a fast radiolytic reduction, at much higher dose rate with electron beams, 2-nm nanoparticles were obtained, showing that the dose rate, which determines the reduction kinetics, has an influence... 

New applications of dichlorodicyanobenzoquinone (DDQ) for the dehydrogenation of ketones include the conversion of a 4,7-dien-3-one into the 4,6,8(14)-trienone, which is further dehydrogenated to the l,4,6,8(14)-tetraenone with acidic catalysis.The dehydrogenation of a 4-en-6-one with DDQ affords the 2,4-dien-6-one. Selective 1,2-dehydrogenation of 5a-cholestan-3-one has been achieved with palladium acetylacetonate and oxygen.Possible alternative mechanisms are discussed. 

Reactions of acetylacetonates with silica are not as general as with alumina. Cu(acac)2 is adsorbed on the silica in high concentrations while the platinum and palladium complexes do not interact with the silica at all and are easily removed by washing. No adequate explanation of these differences was proposed. 3 palladium acetylacetonate complex was also used for the... 

Pt and Pd supported on alumina are prepared by a dry impregnation technique using a toluene solution of platinum or palladium acetylacetonate Pt(C5H702)2 and Pd(CsH702)2, following the procedure already described [92]. 

Pd/AbOs catalyst is prepared by sol-gel method from a precursor solution of palladium acetylacetonate, aluminum tri-sec butoxide and sec-butanol. A required amount of acetic acid is added for the alkoxide hyrolysis and condensation. The obtained gel is then dried overnight at 70°C, calcined in flowing oxygen (1.8 1/h) at 700°C for 2h and reduced in flowing hydrogen ( 1.2 1/h) at 500°C for Ih. 

The syntheses of palladium and platinum organosols [82-85] by the thermolyds of such precursors as palladium acetate, palladium acetylacetonate, and platinum acetylacetonate in hi boiling organic solvents like methyl- o-butylketone have been reported. Likewise, bimetallic colloids of copper and palladium have been prepared from the thermolysis of mixtures of their acetates in similar solvents. [86] These preparations were performed in the absence of stabilizing polymers, and as a residt, relatively broad size distributions and large partides were observed. 

Acetic acid and butadiene yield acetoxyoctadienes in excellent conversions and selectivities. In the presence of palladium acetylacetonate and o-alkyl or o-aryl substituted triarylphosphites in 1 1 molar ratio an... 

Potassium 2-nitrobenzoate (22.6 g, 110 mmol), (l,10-phenanthroline)bis(triphenyl-phosphine)copper(I) nitrate (1.25 g, 1.50 mmol), and palladium acetylacetonate were diluted in deoxygenated, anhydrous mesitylene (150 mL), and 2-bromotoluene (12.3 mL, 100 mmol) was added under an atmosphere of nitrogen. The reaction mixture was stirred for 16 h at 150 °C internal temperature. After cooling to ambient temperature, the reaction mixture was filtered through a pad of Celite and the filter cake was rinsed with ethyl... 

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