Polymerization of Ethylene with Cationic Palladium and Nickel Catalysts Containing Bulky Nonenolizable Imine−Phosphine Ligands

2002 ◽  
Vol 21 (26) ◽  
pp. 5926-5934 ◽  
Author(s):  
Olafs Daugulis ◽  
Maurice Brookhart
Keyword(s):  
Nickel Catalysts ◽  
Phosphine Ligands ◽  
Cationic Palladium

Oligomerization and polymerization of 5-ethylidene-2-norbornene by cationic palladium and nickel catalysts

2020 ◽  
Vol 11 (14) ◽  
pp. 2576-2584 ◽  
Author(s):  
Alexandra H. Farquhar ◽  
Maurice Brookhart ◽  
Alexander J. M. Miller
Keyword(s):  
Nickel Catalysts ◽  
Molecular Weights ◽  
Catalyst Systems ◽  
Cationic Palladium

Nickel- and palladium-based catalyst systems were developed to convert 5-ethylidene-2-norbornene (ENB) to oligomers and polymers with highly controllable molecular weights.

scholarly journals Palladium Catalyzed Alternating Cooligomerization of Ethylene and Carbon Monoxide to Unsaturated Ketones

1995 ◽  
Vol 50 (3) ◽  
pp. 430-438 ◽  
Author(s):  
Wilhelm Keim ◽  
Heiko Maas ◽  
Stefan Mecking
Keyword(s):  
Carbon Monoxide ◽  
Palladium Catalysts ◽  
Methylene Chloride ◽  
General Structure ◽  
Phosphine Ligands ◽  
Unsaturated Ketones ◽  
Palladium Catalyzed ◽  
First Time ◽  
Cationic Palladium

Cationic palladium catalysts have been used to cooligomerize ethylene and carbon monoxide. At high ethylene/CO ratios (m /m = 10:1) in methylene chloride as a solvent, unsaturated alternating cooligomers of the general structure R[C(O)CH2CH2]mH ( m ≥ 1 ; R ≡CH2=CH-, CH2=CHCH2CH2- and CH3CH = CHCH2-) were obtained for the first time. Single component catalyst precursors [(allyl)Pd(P^X )]+Y- (P^X = Ph2P(CH2)nC(= O )OR, Ph2P(CH2)2P(=O)Ph2, Ph2P(CH2)nPh2P(CH2)2S (=O )Ph, n = 1 - 3 , R = Me, Et; Y- = BF4-, SbF6- ) with bidentate P,O- and P,S-ligands as well as in situ catalysts with unfunctionalized phosphine ligands were used. With P"Bu3 as a ligand, selectivities for ethylvinylketone of 40% based on the CO converted were obtained. The hemilabile phosphino-ester and phosphinothiophene ligands behave like monodentate phosphines under catalytic conditions.

scholarly journals Late 3d Metal-Catalyzed (Cross-) Dimerization of Terminal and Internal Alkynes

2021 ◽  
Vol 9 ◽  
Author(s):  
Sebastian M. Weber ◽  
Gerhard Hilt
Keyword(s):  
Nickel Catalysts ◽  
Active Species ◽  
Phosphine Ligands ◽  
Cobalt Catalysts ◽  
Crucial Effect ◽  
Internal Alkynes ◽  
Bidentate Phosphine ◽  
Dimerization Product ◽  
Metal Catalyzed ◽  
Cobalt And Nickel

This review will outline the recent advances in chemo-, regio-, and stereoselective (cross-) dimerization of terminal alkynes to generate 1,3-enynes using different types of iron and cobalt catalysts with altering oxidation states of the active species. In general, the used ligands have a crucial effect on the stereoselectivity of the reaction; e.g., bidentate phosphine ligands in cobalt catalysts can generate the E-configured head-to-head dimerization product, while tridentate phosphine ligands can generate either the Z-configured head-to-head dimerization product or the branched head-to-tail isomer. Furthermore, the hydroalkynylation of silyl-substituted acetylenes as donors to internal alkynes as acceptors will be discussed using cobalt and nickel catalysts.

Selective Preparation of C 2v -Symmetric Hexaphenylbenzene Derivatives through Sequential Suzuki Coupling

Synlett ◽  
2018 ◽  
Vol 29 (12) ◽  
pp. 1597-1600 ◽  
Author(s):  
Tatsuo Kojima ◽  
Shuichi Hiraoka ◽  
Kazuho Ogata
Keyword(s):  
Cross Coupling ◽  
Suzuki Coupling ◽  
Nickel Catalysts ◽  
Phosphine Ligands ◽  
Reaction Conditions ◽  
Aryl Group ◽  
Chloro Group ◽  
Effective Reaction

We have developed effective reaction conditions for the ­Suzuki cross-coupling of chlorinated hexaphenylbenzene derivatives. A chloro group on a hexaphenylbenzene framework exhibits a low reactivity to Suzuki cross-coupling, and only nickel catalysts bearing alkyl-substituted phosphine ligands achieved the coupling. With this as a key step, we succeeded in the selective preparation of a C 2v -symmetric hexaphenylbenzene derivative containing two kinds of aryl group.

Pre-reforming of Liquefied Petroleum Gas over Magnesium Aluminum Mixed Oxide Supported Nickel Catalysts

2013 ◽  
Vol 33 (7) ◽  
pp. 1176-1182
Author(s):  
Xinxing WANG ◽  
Xueguang WANG ◽  
Xingfu SHANG ◽  
Wangxin NIE ◽  
Xiujing ZOU ◽  
...  
Keyword(s):  
Mixed Oxide ◽  
Nickel Catalysts ◽  
Liquefied Petroleum Gas ◽  
Supported Nickel Catalysts

Gas chromatographic study of the sorption of C1-C3 alkanes on nickel catalysts

1969 ◽  
Vol 34 (9) ◽  
pp. 2652-2661
Author(s):  
L. Scháněl ◽  
P. Schneider ◽  
V. Bažant
Keyword(s):  
Nickel Catalysts ◽  
Chromatographic Study

Catalyst Selection for Hydrogenation of 1,2-Dihydroacenaphthylene

1998 ◽  
Vol 63 (11) ◽  
pp. 1945-1953 ◽  
Author(s):  
Jiří Hanika ◽  
Karel Sporka ◽  
Petr Macoun ◽  
Vladimír Kysilka
Keyword(s):  
Activation Energy ◽  
Nickel Catalyst ◽  
Palladium Catalyst ◽  
Active Component ◽  
Reaction Order ◽  
Nickel Catalysts ◽  
Practical Application ◽  
Repeated Use ◽  
Selection For ◽  
Catalyst Selection

The activity of ruthenium, palladium, and nickel catalysts for the hydrogenation of 1,2-dihydroacenaphthylene in cyclohexane solution was studied at temperatures up to 180 °C and pressures up to 8 MPa. The GC-MS technique was used to identify most of the perhydroacenaphthylene stereoisomers, whose fractions in the product were found dependent on the nature of the active component of the catalyst. The hydrogenation was fastest on the palladium catalyst (3% Pd/C). The nickel catalyst Ni-NiO/Al2O3, which is sufficiently active also after repeated use, can be recommended for practical application. The activation energy of 1,2-dihydroacenaphthylene hydrogenation using this catalyst is 17 kJ/mol, the reaction order with respect to hydrogen is unity.

Highly active and poison-tolerant nickel catalysts for tar reforming synthesized through controlled hydrothermal synthesis

2020 ◽  
Vol 607 ◽  
pp. 117779 ◽  
Author(s):  
Dara Khairunnisa Binte Mohamed ◽  
Andrei Veksha ◽  
Teik-Thye Lim ◽  
Grzegorz Lisak
Keyword(s):  
Hydrothermal Synthesis ◽  
Nickel Catalysts ◽  
Highly Active ◽  
Tar Reforming
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