Home About us Contact
|
Home About us Contact | ||
|
|
||
Enantioselective Hydrosilylation (enantioselective + hydrosilylation)
Selected AbstractsA Novel D2 -Symmetrical Chiral Tetraoxazoline Ligand for Highly Enantioselective Hydrosilylation of Aromatic KetonesADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 7 2010Wei Jie Li Abstract A novel D2 -symmetrical chiral tetraoxazoline ligand was synthesized from 1,2,4,5-benzenetetracarboxylic acid and L -valinol via a one-pot reaction, and the asymmetric hydrosilylation of aromatic ketones was carried out in dichloromethane in the presence of 1.0,mol% of a bivalent copper ion catalyst with the tetraoxazoline to give optically active secondary alcohols. The chiral catalyst showed excellent activities and enantioselectivities in the hydrosilylation of aryl ketones with up to 99% ee. [source] Convenient Enantioselective Hydrosilylation of Ketones Catalyzed by Zinc-Macrocyclic Oligoamine ComplexesADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 7-8 2009Jadwiga Gajewy Abstract Chiral macrocyclic tetra- and hexamine macrocycles derived from trans -1,2-diaminocyclohexane (DACH) in complexes with diethylzinc efficiently catalyze the asymmetric hydrosilylation of aryl alkyl ketones with enantiomeric excess of the product up to 89%. The cyclic structure of the trianglamine ligand increases the enantioselectivity of the reaction, in comparison to the catalysis with the acyclic N,N, -dibenzyl-DACH ligand. Density functional theory (DFT) computations on the structures of ligand-zinc complexes and on the structures of these complexes with a coordinated acetophenone molecule allow us to rationalize the direction of the asymmetric induction of the hydrosilylation reaction as well as the superiority of the cyclic ligand compared to the acyclic one. This is the first example of asymmetric catalysis for the hydrosilylation reaction of ketones with the use of a readily available, inexpensive, and reusable macrocyclic trianglamine ligand. [source] ChemInform Abstract: Enantioselective Hydrosilylation of Ketimines with Trichlorosilane Promoted by Chiral N-Picolinoyl Amino Alcohols.CHEMINFORM, Issue 9 2008Hongjie Zheng Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] Zinc-Catalyzed Enantioselective Hydrosilylation of Imines.CHEMINFORM, Issue 44 2006Bu-Mahn Park Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Bis(oxazoline)titanium Complexes as Chiral Catalysts for Enantioselective Hydrosilylation of Ketones , A Combined Experimental and Theoretical Investigation.CHEMINFORM, Issue 47 2003Marco Bandini Abstract For Abstract see ChemInform Abstract in Full Text. [source] Application of a New Family of P,N Ligands to the Highly Enantioselective Hydrosilylation of Aryl Alkyl and Dialkyl Ketones.CHEMINFORM, Issue 5 2003Beata Tao Abstract For Abstract see ChemInform Abstract in Full Text. [source] Highly Enantioselective Hydrosilylation of Aromatic Alkenes.CHEMINFORM, Issue 35 2002Jakob F. Jensen Abstract For Abstract see ChemInform Abstract in Full Text. [source] The First General, Highly Enantioselective Lewis Base Organo- catalyzed Hydrosilylation of Benzoxazinones and QuinoxalinonesADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 13 2010Zhou-Yang Xue Abstract The first general, highly enantioselective hydrosilylation of benzoxazinones and quinoxalinones has been developed. The chiral Lewis base organocatalysts that are readily accessible from (1S,2R)-ephedrine and (1R,2S)-ephedrine promoted the title reaction to afford various chiral dihydrobenzoxazinones and dihydroquinoxalinones with good yields as well as good enantioselectivities. [source] New efficient copper fluoride-based catalyst for enantioselective hydrosilylation of ketones in aerobic conditionsISRAEL JOURNAL OF CHEMISTRY, Issue 4 2001James Courmarcel A new copper(II) fluoride,chiral diphosphines catalytic system was developed. This one is very efficient and selective for the hydrosilylation of several substituted or unsubstituted aromatic ketones in so far as moderate to excellent enantioselectivities were obtained. An oxygen acceleration effect was observed that led us to propose a practical protocol with a low amount of catalyst. [source] | ||||||||||