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Efficient Ligands (efficient + ligand)
Selected AbstractsChemInform Abstract: Oxazolidin-2-one as Efficient Ligand for the Copper-Catalyzed N-Arylation of Pyrrole, Imidazole and Indole.CHEMINFORM, Issue 39 2010Hengchang Ma Abstract The easy preparation, broad substrate applicability and substituent compatibility of this catalyst system renders the oxazolidine-2-one system great advantages over previous Cu-catalyzed N-arylation methods. [source] ChemInform Abstract: An Inexpensive Cyclodiphosphazane as an Efficient Ligand for the Palladium-Catalyzed Amination of Aryl Bromides and Chlorides.CHEMINFORM, Issue 7 2010R. Rama Suresh Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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] ChemInform Abstract: (t-Bu)2PN=P(i-BuNCH2CH2)3N: New Efficient Ligand for Palladium-Catalyzed C,N Couplings of Aryl and Heteroaryl Bromides and Chlorides and for Vinyl Bromides at Room Temperature.CHEMINFORM, Issue 35 2008Ch. Venkat Reddy 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] ChemInform Abstract: Monooxychlorophosphine as a Novel and Efficient Ligand for Palladium-Catalyzed Suzuki,Miyaura Cross-Coupling of Aryl Chlorides.CHEMINFORM, Issue 3 2008Wenpeng Mai 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] Highly Efficient Ligands for the Palladium-Assisted Double N -Arylation of Primary Amines for One-Sep Construction of CarbazolesADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 4 2010Yibo Zhou Abstract A highly efficient one-pot synthesis of carbazoles via palladium-catalyzed double N -arylation of primary amines with 2,2,-dihalobiphenyls is described using a catalyst system comprised of tris(dibenzylideneacetone)dipalladium(0) (Pd2dba3) and the proazaphosphatrane P(i -BuNCH2CH2)3N (8) or its derivative (t- Bu)2PNP(i- BuNCH2CH2)3N (9a) as the ligand. The process is effective for double N -arylation of 2,2,-biphenyl dibromide, diiodide, and even dichloride with a variety of primary amines including neutral, electron-rich, electron-deficient, and sterically hindered anilines as well as aliphatic amines. [source] ChemInform Abstract: Chiral Pyridyl Phosphinites with Large Aryl Substituents as Efficient Ligands for the Asymmetric Iridium-Catalyzed Hydrogenation of Difficult Substrates.CHEMINFORM, Issue 41 2010David H. Woodmansee No abstract is available for this article. [source] ChemInform Abstract: From C2 - to D2 -Symmetric: Atropos Phosphoramidites with a D2 -Symmetric Backbone as Highly Efficient Ligands in Cu- Catalyzed Conjugate Additions.CHEMINFORM, Issue 39 2010Hui Zhang Abstract The axially chiral phosphoramidites (I) afford similar yields and enantioselectivities in the transformations tested. [source] ChemInform Abstract: Hydroxyalkyl Thiazolines, a New Class of Highly Efficient Ligands for Carbonyl Additions.CHEMINFORM, Issue 17 2009Michael Bauer 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] ChemInform Abstract: Electron-Rich, Bicyclic Biaryl-Like KITPHOS Monophosphines via [4 + 2] Cycloaddition Between 1-Alkynylphosphine Oxides and Anthracene: Highly Efficient Ligands for Palladium-Catalyzed C,N and C,C Bond Formation.CHEMINFORM, Issue 52 2008Simon Doherty 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] Design and Synthesis of Thioether-Imidazolium Chlorides as Efficient Ligands for Palladium-Catalyzed Suzuki,Miyaura Coupling of Aryl Bromides with Arylboronic Acids.CHEMINFORM, Issue 51 2007Masami Kuriyama 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] The Use of Iminopyridines as Efficient Ligands in the Palladium(II)-Catalyzed Cyclization of (Z)-4,-Acetoxy-2,-butenyl 2-Alkynoates.CHEMINFORM, Issue 38 2007Juan Song 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] Chiral Diphosphites and Diphosphoramidites as Cheap and Efficient Ligands in Rh-Catalyzed Asymmetric Olefin Hydrogenation.CHEMINFORM, Issue 41 2006Manfred T. Reetz 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] Ketopinic Acid Derived Bis(hydroxy amides) as Cheap, Chiral Ligands for the Enantioselective Ethylation of Aromatic AldehydesEUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 9 2010Tomás de las Casas Engel Abstract Readily accessible, C2 - and pseudo- C2 -symmetric bis(hydroxy amides), derived from commercially available (+)-ketopinic acid and protic diamines, are promising, cheap, chiral ligands for the synthetically valuable, enantioselective addition of organozinc reagents to carbon electrophiles. A series of ligands of this type, having key structural differences, has been synthesized and tested in the enantioselective ethylation of benzaldehydes and (E)-cinnamaldehyde, in order to gain information on the origin of ligand efficiency. The results obtained allow for the definition of a privileged structural pattern for the design of improved cheap ligands and support interesting models proposed for both the acting catalytic species and the controlling transition states. The most efficient ligands proved to be less efficient than commercially available (,)-MIB; nevertheless, an impressive efficiency level was obtained, which should sustain interest in this cheap type of ligands. [source] Synthesis and enantioselectivities of soluble polymers incorporating optically active binaphthyl and binaphtholJOURNAL OF APPLIED POLYMER SCIENCE, Issue 2 2007Xiaowei Zou Abstract A polymer (P-1) was synthesized through the polymerization of (S)-6,6,-dibromo-3,3,-dibutyl-1,1,-binaphthol with (S)-2,2,-dioctoxy-1,1,-binaphthyl-6,6,-boronic acid in a Pd-catalyzed Suzuki reaction, and another polymer (P-2) was synthesized through the polymerization of (S)-6,6,-dibromo-3,3,-dibutyl-1,1,-binaphthol with (S)-6,6,-diethynyl-2,2,-dioctoxy-1,1,-binaphthyl in a Pd-catalyzed Sonogashira reaction. The two polymers showed good solubility in some common solvents and were characterized with NMR, Fourier transform infrared, gel permeation chromatography, and circular dichroism spectroscopy. The application of the chiral monomers and polymers in the asymmetric addition of diethyl zinc to benzaldehyde was studied. The results indicated that P-1, P-2, and the monomer (S)-3,3,-dibutyl-1,1,-binaphthol were efficient ligands in the asymmetric addition of diethyl zinc to benzaldehyde. The chiral polymer ligands P-1 and P-2 were more efficient than their monomeric version, (S)-3,3,-dibutyl-1,1,-binaphthol, and could be easily recovered and reused without a loss of catalytic activity or enantioselectivity. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007 [source] Synthesis of 4-substituted styrene compounds via palladium catalyzed Suzuki,Miyaura reaction using bidentate Schiff base ligandsAPPLIED ORGANOMETALLIC CHEMISTRY, Issue 11 2009Yan Liu Abstract Air-stable symmetric Schiff base have been synthesized and proved to be efficient ligands for Suzuki,Miyaura reaction between aryl bromides and arylboronic acids using PdCl2(CH3CN)2 as palladium source under aerobic conditions. The coupling reaction proceeded smoothly using N,N -bis(anthracen-9-ylmethylene)benzene-1,2-diamine (L7) as ligand to provide 4-substituted styrene compounds in good yields. Copyright © 2009 John Wiley & Sons, Ltd. [source] Design of Multivalent Galactoside Ligands and Their Binding to Hepatic Asialoglycoprotein ReceptorCHINESE JOURNAL OF CHEMISTRY, Issue 8 2006Xiao-Ru Zhang Abstract In an effort to find highly efficient ligands for hepatic asialoglycoprotein receptor (ASGPR), four cluster galactosides with different scaffolds were synthesized in this paper. The affinity of these compounds for ASGPR was analyzed by binding study invitro. The results showed that trivalent cluster galactosides behaved better than divalent analogues and the cluster galactosides with aryl groups on their scaffolds presented better binding affinity than those with aliphatic chain scaffolds. [source] | ||||||||||