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New Catalytic System (new + catalytic_system)

Distribution by Scientific Domains
Chemistry100%

Selected Abstracts

SeO2/H2O2/H2O-Dioxane: A New Catalytic System for trans Dihydroxylation of Olefins.

CHEMINFORM, Issue 51 2007
Pranjal Gogoi
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]

New Catalytic System for S,S and Se,Se Bond Addition to Alkynes Based on Phosphite Ligands.

CHEMINFORM, Issue 29 2005
Valentine P. Ananikov
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Cp*Ir Complex-Catalyzed N-Heterocyclization of Primary Amines with Diols: A New Catalytic System for Environmentally Benign Synthesis of Cyclic Amines.

CHEMINFORM, Issue 4 2005
Ken-ichi Fujita
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Metal Triflates,Methanesulfonic Acid as New Catalytic Systems: Application to the Fries Rearrangement.

CHEMINFORM, Issue 47 2003
Omar Mouhtady
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Highly Regioselective and Rapid Hydroformylation of Alkyl Acrylates Catalyzed by a Rhodium Complex with a Tetraphosphorus Ligand

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 4 2009
Shichao Yu
Abstract Alkyl acrylates have been hydroformylated to the linear aldehydes with high regioselectivity (linear/branch>99/1) and extraordinarily high average turnover frequencies (up to 5400,h,1) by using a rhodium complex with a tetraphosphorus ligand. This protocol is in sharp contrast to the most of other processes that favor production of the branched aldehyde (typically>95% branched for most Rh-catalyzed reaction systems). The high turnover number achieved by this new catalytic system is also remarkable considering the less reactive character of alkyl acrylates to the hydroformylation reaction conditions. [source]

The effect of adding Crabtree's catalyst to rhodium black in direct hydrogen isotope exchange reactions

JOURNAL OF LABELLED COMPOUNDS AND RADIOPHARMACEUTICALS, Issue 9 2009
Søren Christian Schou
Abstract A new catalytic system based on rhodium black using Crabtree's catalyst as an additive for direct hydrogen isotope exchange in aromatic compounds has been investigated. The level of deuterium incorporation can be improved from for example 16 to 93%. The new catalyst mixture tolerates a variety of solvents. Copyright © 2009 John Wiley & Sons, Ltd. [source]

Palladium supported on polyether-functionalized mesoporous silica.

APPLIED ORGANOMETALLIC CHEMISTRY, Issue 3 2010
Synthesis, application as catalyst for Heck coupling reaction
Abstract A new catalytic system based on Pd supported on polyether-functionalized mesoporous silica was prepared. This material was obtained by co-hydrolysis and polycondensation of tetraethylorthosilicate and a bis-silylated triblock copolymer P123 (Mw = 5800) followed by the decomposition of Pd(OAc)2 salt. We have shown that this material can be applied as powerful heterogeneous catalyst for the Heck coupling reaction. Copyright © 2009 John Wiley & Sons, Ltd. [source]

Two Distinct Mechanisms of Alkyne Insertion into the Metal,Sulfur Bond: Combined Experimental and Theoretical Study and Application in Catalysis

CHEMISTRY - A EUROPEAN JOURNAL, Issue 7 2010
Valentine
Abstract The present study reports the evidence for the multiple carbon,carbon bond insertion into the metal,heteroatom bond via a five-coordinate metal complex. Detailed analysis of the model catalytic reaction of the carbon,sulfur (CS) bond formation unveiled the mechanism of metal-mediated alkyne insertion: a new pathway of CS bond formation without preliminary ligand dissociation was revealed based on experimental and theoretical investigations. According to this pathway alkyne insertion into the metal,sulfur bond led to the formation of intermediate metal complex capable of direct CS reductive elimination. In contrast, an intermediate metal complex formed through alkyne insertion through the traditional pathway involving preliminary ligand dissociation suffered from "improper" geometry configuration, which may block the whole catalytic cycle. A new catalytic system was developed to solve the problem of stereoselective SS bond addition to internal alkynes and a cost-efficient Ni-catalyzed synthetic procedure is reported to furnish formation of target vinyl sulfides with high yields (up to 99,%) and excellent Z/E selectivity (>99:1). [source]