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Phosphite Ligands (phosphite + ligand)
Selected AbstractsChemInform Abstract: New Ionic Phosphite Ligands: Synthesis and Application in Asymmetric Rh-Catalyzed Hydrogenation.CHEMINFORM, Issue 34 2010S. E. Lyubimov Abstract The chiral phosphites are based on pyridinium and imidazolium ionic liquids and are coordinated in the monodendate mode to afford rhodium complexes. [source] ChemInform Abstract: Highly Regioselective Hydroformylation of Enamides with Phosphite Ligands.CHEMINFORM, Issue 34 2008Ourida Saidi 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] Polymer-Supported Monodentate Phosphite Ligands for Asymmetric Hydrogenation.CHEMINFORM, Issue 40 2006Weiping Chen 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 2005Valentine P. Ananikov Abstract For Abstract see ChemInform Abstract in Full Text. [source] The reaction of mixtures of [Rh4(CO)12] and triphenylphosphite with carbon monoxide or syngas as studied by high-resolution, high-pressure NMR spectroscopy,MAGNETIC RESONANCE IN CHEMISTRY, Issue S1 2008Gillian Overend Abstract The fragmentation and redistribution reactions of [Rh4(CO)12,x{P(OPh)3}x] (x = 1,4) with carbon monoxide have been studied using high-resolution, high-pressure NMR spectroscopy. Under the conditions of efficient gas mixing in a high-pressure NMR bubble column, [Rh4(CO)9{P(OPh)3}3] fragments to give mainly [Rh2(CO)6{P(OPh)3}2]; [Rh4(CO)11{P(OPh)3}] is also observed, implying redistribution of the phosphite ligand and/or recombination of the dimers to tetrameric clusters. Fragmentation of [Rh4(CO)10{P(OPh)3}2] is found to be pressure-dependent giving predominantly [Rh2(CO)6{P(OPh)3}2] at low CO pressure (1,40 bar), and increasing amounts of [Rh2(CO)7{P(OPh)3}] at higher (40,80 bar) pressure. Using Syngas (CO : H2 (1:1)) instead of CO in the above fragmentations, homolytic addition of H2 to the dimer [Rh2(CO)6{P(OPh)3}2] to give [RhH(CO)3{P(OPh3}] and [RhH(CO)2{P(OPh)3}2] is observed. The distribution of tetrameric species obtained is similar to that obtained under the same partial pressure of CO. On depressurisation/out-gassing of the sample, the original mixture of tetrameric clusters is obtained. Copyright © 2008 John Wiley & Sons, Ltd. [source] Lewis Acid Controlled Regioselectivity in Styrene HydrocyanationCHEMISTRY - A EUROPEAN JOURNAL, Issue 35 2009Laura Bini Abstract According to present knowledge, the Ni-catalyzed hydrocyanation of styrene leads predominantly to the branched product 2-phenylpropionitrile (98,%). We observed a dramatic inversion of the regioselectivity upon addition of a Lewis acid. Up to 83,% of the linear product 3-phenylpropionitrile was obtained by applying phosphite ligands in the presence of AlCl3. The mechanism of the Ni-catalyzed reaction and the influence of additional Lewis acids have been investigated by means of deuterium labeling experiments, NMR studies, and DFT calculations. Furthermore, the behavior of different Lewis acids, such as CuCN, could be rationalized and predicted by DFT calculations. [source] | ||||||||||