[PDF] Top 20 Asymmetric catalysis using iron complexes : 'ruthenium lite'?

... groupmates ruthenium and osmium, and close to its catalytically distinguished neighbours, iron appears to be ideally placed to form the basis of asymmetric ...of iron over the more precious ... See full document

... Metal complexes of cyclopentadienones, notably ruthenium [1] and iron [2] derivatives of general structure 1 and 2, have been applied as catalysts in hydrogen transfer reactions [3], operating via ... See full document

... of ruthenium into the N-H(Ts) bond to form ruthenium hydride 27 (Scheme 3) which transfers two hydrogen atoms to substrate to give ...‘bifunctional’ catalysis mechanism exhibited by related ... See full document

... nitrosyl complexes of ruthenium are already reported involving their geometry optimization and verification through furnished x-ray data (58) involving the complex in conformation of minimum energy and not ... See full document

... cyclopentadienone iron tricarbonyl complexes with diverse structures were prepared, in each case using the intramolecular cyclisation of a diyne as a key ...The complexes were generated as ... See full document

... synthesised iron complexes 50 were tested for the asymmetric activity through use as the hydrogen transfer catalyst for the reaction of acetophenone 24 with formic acid being used as the hydrogen ... See full document

... when catalysis is involved, homogeneous asymmetric catalysis can be an applicable process for industry and in recent years the industrial application of enantioselective homogeneous catalysis ... See full document

... This makes the reduction of ketones by IPA a reversible process. To shift the equilibrium towards the desired product IPA is most frequently used as the solvent of the reaction as the life-time of many metal catalysts in ... See full document

... through the use of a larger group on the chiral centre, we examined derivatives of 8 where R 3 =Ph. Ru/TsDPEN catalysts are less effective at reduction of aryl/propargylic ketones 10c- 10e, 16 therefore these were ... See full document

... The effect of ligand structure upon catalyst activity and enantioselectivity, and the resultant development of new catalysts, is discussed throughout this review. Experimental results, by in large, have supported the ... See full document

... Abstract This thesis is devoted to the study of the electronic structure of binuclear and monomeric, halide complexes of technetium and ruthenium using the techniques of voltammetry, UV-[r] ... See full document

... a ruthenium metal centre bearing a chiral diphosphine and a chiral diamine ligand, see Figure 1 ...the asymmetric hydrogenation of a wide range of unfunctionalised ketones now became possible, without the ... See full document

... complexes (Sl. No. 1, 2 & 3) were recorded in CDCl 3 / TMS to substantiate further metal-ligand bonding. The aromatic protons signals are observed at δ7.8 – 8.6 PPM and the aromatic proton at position -5 is ... See full document

... and iron content on selected samples was performed using a PANalytical Axios WDXRF (wavelength dispersive X-ray fluorescence) spectrometer with a 4 kW Rh tube and a Philips PV 9400 X atomic absorption ... See full document

... catalytic asymmetric allylation procedures are the first to achieve high levels of enantioselectivity for the allylation of aldehydes using catalytic quantities of a chiral Lewis acid, which is based on the ... See full document

... Cross-coupling reactions are the most common method to access highly valuable and functionalized molecules. With the new research based on the C-H activation, direct arylation of such bond became of great interest. ... See full document

... 90 pathway design, broad substrate scope and the low cost of catalyst. However the requirement for the use of a 1,3-diyne in large excess, coupled to the fact that 1,3-diynes may be difficult to prepare and in some ... See full document

... step. Using the Heathcock model previously suggested for these systems the favoured pre-transition state assembly 306 shows higher steric congestion when using β-substituted Michael acceptors and an ... See full document

... halomethyl complexes of almost all of the other transition metals have appeared, as yet there are none concerning ...such complexes described for the other two members of this triad, palladium and ... See full document

... base catalysis, where the first step is activation of the substrate by deprotonation, was described by Wynberg and Helder in 1975 with the conjugate addition of nitrosulfones to !,"-unsaturated ketones ... See full document