5445-46-5Relevant academic research and scientific papers
A method of preparation of ethylene-propylene-diene rubber
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Paragraph 0044; 0046, (2017/03/23)
The invention discloses a bridged metallocene complex, which is characterized by having a structural formula shown as the following A1, A2, A3 or A4. The invention also discloses a preparation method of ethylene propylene rubber. The ethylene propylene ru
A bridge linking and its application of metal complexes
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Paragraph 0045, (2017/02/23)
The invention discloses a bridged metallocene complex, which is characterized by having a structural formula shown as the following A1, A2, A3 or A4. The invention also discloses a preparation method of ethylene propylene rubber. The ethylene propylene ru
Stereoselection in the corey-bakshi-shibata reduction: Insight from kinetic isotope effects and transition-structure modeling
Zhu, Hui,O'leary, Daniel J.,Meyer, Matthew P.
supporting information, p. 11890 - 11893 (2013/01/15)
Flexible but demanding: Significant steric demand is isolated to the small (iPr) substituent in the oxazaborolidine-catalyzed borane (CBS) reduction of 2',5'-dimethylisobutyrophenone. Computed transition-structure models (see picture) demonstrate that nea
Cationic intermediates in Friedel-Crafts acylation: Structural information from theory and experiment
Zhu, Hui,Meyer, Matthew P.
supporting information; experimental part, p. 409 - 411 (2011/02/28)
Experimentally-determined intramolecular and intermolecular deuterium kinetic isotope effects and computational studies imply three possible kinetic scenarios for the Friedel-Crafts acylation of xylene. The influence of the structural and energetic proper
Synthesis of a chiral palladacycle and its application in asymmetric hydrophosphanation reactions
Ding, Yi,Zhang, Yi,Li, Yongxin,Pullarkat, Sumod A.,Andrews, Paul,Leung, Pak-Hing
experimental part, p. 4427 - 4437 (2011/02/27)
A novel amine ligand, 1-(2,5-dimethylphenyl)-N,N,2,2-tetramethylpropan- 1-amine, was synthesized in six steps from commercially available p-xylene. Direct ortho-palladation of this amine ligand proceeded readily to form the racemic dimeric complex. The pa
Experimental transition state for the Corey-Bakshi-Shibata reduction
Saavedra, Jaime,Stafford, Sean E.,Meyer, Matthew P.
supporting information; experimental part, p. 1324 - 1327 (2009/06/28)
Asymmetric reductions of prochiral ketones are important transformations in the syntheses of natural products, pharmaceuticals, and fine chemicals. The Corey-Bakshi-Shibata reduction is unique among hydride transfer reductions in its tremendous substrate
Nonbonding interactions and stereoselection in the Corey-Bakshi-Shibata reduction
Meyer, Matthew P.
supporting information; experimental part, p. 4338 - 4341 (2009/12/26)
Deuterium kinetic isotope effect measurements upon enantiotopic methyl groups for the Corey-Bakshi-Shibata reduction of 2',5'-dimethylphenyl isopropyl ketone suggest a complex role for nonbonding Interactions In the mediation of stereoselectlon.
Friedel-Crafts acylation reaction using carboxylic acids as acylating agents
Kawamura, Masato,Cui, Dong-Mei,Shimada, Shigeru
, p. 9201 - 9209 (2007/10/03)
Dehydrative Friedel-Crafts acylation reaction of aromatic compounds with carboxylic acids as acylating agents was investigated in the presence of Lewis acid- or Br?nsted acid-catalyst. Various metal triflates and bis(trifluoromethanesulfonyl)amides showed catalytic activity at high temperature, among which Eu(NTf2)3 proved to be the most effective and efficiently catalyzed the acylation reaction of alkyl- and alkoxybenzenes with aliphatic and aromatic carboxylic acids at 250 °C. Bi(NTf2)3 was more effective than Eu(NTf2)3 at lower temperature, but proved to be hydrolyzed in the presence of a small amount of water to give HNTf2 and [Bi6O4(OH)4(H2O)6](NTf2)6. The structure of the latter compound was confirmed by a single crystal X-ray analysis. Among five Br?nsted acids, HOTf, HNTf2, HCTf3, TsOH, and Nafion SAC-13, HNTf2 has proved to be the most efficient catalyst and more effective than Eu(NTf2)3 for the acylation of p-xylene with heptanoic acid at 220 °C or lower temperature. HNTf2 catalyzed the acylation of anisole with carboxylic acids in high yields in refluxing toluene with azeotropic removal of water.
Lewis acid-catalyzed Friedel-Crafts acylation reaction using carboxylic acids as acylating agents
Kawamura, Masato,Cui, Dong-Mei,Hayashi, Teruyuki,Shimada, Shigeru
, p. 7715 - 7717 (2007/10/03)
Rare-earth metal Lewis acids, in particular Eu(NTf2) 3, were found to be efficient catalysts for Friedel-Crafts acylation reaction using aliphatic as well as aromatic carboxylic acids as acylating agents at high temperature.
STEREOSELECTIVE COMPLEXATION OF PROCHIRAL ARENES. PART I. ASYMMETRIC INDUCTION MEDIATED BY AN ALPHA CHIRAL CENTER
Rosca, Sinziana,Orfanu, Cristina,Stan, Raluca,Rosca, Sorin I.
, p. 1225 - 1234 (2007/10/03)
Diastereoselective Cr(CO)3-complexation of 2,5-dimethylphenyl-alkyl-carbinols was studied. Depending on the structure of the asymmetric alpha carbon atom, a diastereomeric excess of 12-96 percent was obtained. A relative configuration R*S* of the resulted complexes is infered, indicating a preferential complexation from the same side with carbinolic hydroxyl group.
