Nickel bis acetylacetonate

Nickel, bis(acetylacetone)-polymerization isomerism, 1, 187 Nickel, bis(dinitrogcn)(oxygen)-synthesis... 

Similarly to the zirconocene/MAO catalysts, the activity of the Idemitsu catalyst systems is poor when the whole catalyst system (catalyst-i-co-catalyst) is taken into account. In the very best example (in terms of catalyst activity and polymer yield) nickel bis (acetylacetonate) was used in combination with MAO (molar ratio 1 200) to homopolymerize norbornene in toluene at 50 °C for 4 h affording a 70% conversion into high molecular weight (M 2.2x10 ), toluene-soluble poly-(norbornene). The ratio of norbornene to nickel was 20000 1 and the ratio of norbornene to aluminum was only 100 1. Thus, while the yield of polymer is high based on the nickel catalyst (25 700 g per g nickel), the yield based on aluminum is very poor (260 g per g aluminum or about 120 g per g MAO). It can readily be estimated that the cost of the MAO activator alone would add significantly to the cost of the polymer, as well as requiring costly removal of catalyst residues from the polymer. 

The monomers dealt with can be polymerized by various mechanisms, not only by ROMP. For example, a rapid polymerization of norbornadiene occurs using a homogeneous catalytic system consisting of nickel acetylacetonate or a nickel-phosphine complex, such as nickel bis-(tri-n-butylphosphine) dichloride (NiCl2(TBP)2) or nickel bis-(tricyclohexylphosphine) dichloride (NiCl2(TBP)2). Nickel acetylacetonate as catalyst is known to initiate rather a classical vinyl polymerization (7). The classical vinyl polymerization... 

It has been verified by electron-spin magnetic-resonance spectroscopy that for copper(II) bis-acetylacetonate26 in mole-percent solution in a crystal of palladium(IJ) bis-acetylacetonate and for copper (II) bis-salicylaldehyde-imine27 in mole-percent solution in a crystal of nickel(II) bis-salicylaldehyde-imine the four coplanar short bonds formed by the copper atom are largely covalent and the two long bonds have very little covalent character. 

Estimated A/h values (MHz) for H, l3C and 14N nuclei of pyridine and y-picoline axially bis-coordinated to nickel(II) bis-acetylacetonate... 

Naphthalenecarboxylic acid, 5,6,7,8-tetrahydro-3-methoxy-, methyl ester, 65, 98 Nickel acetylacetonate Nickel, bis(2,4-pentanedionato-0,0 )-, (SP-4-1) ... 

Keywords monomers propylene oxide and styrene, selective oxidation, dioxygen, ethylbenzene, a-phenylethylhydroperoxide, nickel (II) bis (acetylacetonate), N-metylpirrolidon-2, HMPA, MSt (M=Na, K), PhOH. 

BIS(4-IMINO-2-PENTANONATO)NlCKEL(n) [Nickel(n) Acetylacetone Imide]... 

Butadiene and secondary amines, with a catalyst formed from nickel(II) acetylacetonate and triethylaluminum in the presence of chiral phosphonite ligands derived from menthol, 1,2 5.6-di-O-isopropylideneglucose or cholesterol, give linear and branched telomers along with simple addition products and cyclic dimers6. The linear telomers are the major products. An optical yield of 37 % was obtained for the branched morpholine telomer 2. which was obtained in 30 % yield when bis(menthoxy)(2-methylpropyl)phosphane was employed. 

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