Asymmetric transfer hydrogenation of selected compounds using
Asymmetric Transfer Hydrogenation of Secondary Allylic Alcohols
... One: Transfer Hydrogenation Reactions 1.1: Introduction Hydrogenation is a process by which hydrogen atoms are added to an unsaturated organic compound, usually in the presence of a metal ...
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Recent developments in the area of asymmetric transfer hydrogenation
... for transfer hydrogenation using (1R,2S)-1 as ...the asymmetric induction is less clear, however the highly rigid nature of the amino indanol ligand ensures that any complex will be well ...
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Asymmetric transfer hydrogenation reductions using tethered ruthenium (II) catalysts
... 10 alcohol substrate. Secondly depending on the tartrate enantiomer used, the system is able to deliver the epoxide oxygen from the same enantioface of the olefin regardless of the substitution pattern. As illustrated in ...
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Asymmetric transfer hydrogenation by synthetic catalysts in cancer cells
... active transfer hydrogenation catalysts that out-perform ruthenium analogues under similar conditions, but also as cancer-cell-selective asymmetric catalysts with novel mechanisms of anticancer ...
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Easy to synthesize, robust organo osmium asymmetric transfer hydrogenation catalysts
... Upon treatment with base in the course of a catalytic appli- cation, Ru pre-catalyst 1 eliminates HCl, forming the active 16- electron amido complex 2. During the reduction, the catalyst cycles between 2 which contains a ...
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N Functionalised TsDPEN catalysts for asymmetric transfer hydrogenation; synthesis and applications
... 4 solubility and activity in the reduction of ketones in water. 10 Applications of N’-alkylated derivatives of N-tosyl-1,2-diaminocyclohexane to ATH have been reported, 11a,b as have secondary amine ligands derived from ...
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Asymmetric Transfer Hydrogenation in Water with Platinum Group Metal Catalysts3-19
... 2 using nuclear magnetic resonance (NMR) spectroscopy, kinetic and isotope measure- ments, and density functional theory (DFT) calcula- tions, we showed that two catalytic cycles are likely to operate in the ATH ...
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Mechanistic Complexity of Asymmetric Transfer Hydrogenation with Simple Mn–Diamine Catalysts
... A stoichiometric reactivity study was performed using 1 H NMR spectroscopy to experimentally substantiate results obtained with DFT. Reaction of 1- Cis and KO t Bu in THF-d 8 (i.e., in the absence of i PrOH) led ...
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Development of catalysts for asymmetric hydrogenation
... the transfer hydrogenation process, possibly exhibiting improved co-ordination to the metal ...ketones using transition metal-free catalysts. The transfer hydrogenation process found to ...
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Ether tethered Ru(ii)/TsDPEN complexes : synthesis and applications to asymmetric transfer hydrogenation
... Figure 2. Substrate reduction modes using (R,R)-5. Having established that an ether-tethered catalyst was viable for 60 ATH of ketones, we wished to investigate the effect of an ether- or alcohol-containing chain ...
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Application of ruthenium complexes of triazole containing tridentate ligands to asymmetric transfer hydrogenation of ketones
... Initial tests focused on the use of a range of metals with ligand 8, which was closest in structure to those previously reported. Of these, only Ru 3 (CO) 12 gave a product of any significant ee. However this represented ...
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Developing asymmetric iron and ruthenium based cyclone complexes : complex factors influence the asymmetric induction in the transfer hydrogenation of ketones
... 2.092 mmol, 1.1 eq.) at -78 o C. After 1 h at -78 o C, trimethylsilylchloride (0.29 cm 3 , 0.248 g, 2.283 mmol, 1.2 eq.) 60 was added and the mixture stirred at -78 o C for 1 h before being allowed to warm to room ...
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Application of proline functionalised 1,2 diphenylethane 1,2 diamine (DPEN) in asymmetric transfer hydrogenation of ketones
... Ligands 22 and 23 have four coordination sites, therefore it is possible to coordinate two metal centres to each ligand forming a diruthenium complex. ITo test the effect of altering the metal : ligand ratio, ...
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The importance of the N–H bond in Ru/TsDPEN complexes for asymmetric transfer hydrogenation of ketones and imines
... state using 1 and 5 It has been reported that the use of N-methylated and N’,N’- dimethylated derivative of TsDPEN are poor catalysts for ATH reactions when a mestylene group is employed as the ...
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Application of tethered ruthenium catalysts to asymmetric hydrogenation of ketones, and the selective Hydrogenation of aldehydes
... (R using (S,S)-7) at S/C ...for using an asymmetric catalysts that works under completely neutral ...these compounds, 7 whilst the high ee and sense of reduction to give 30 indicates that the ...
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Imino transfer hydrogenation reductions
... Imino Transfer Hydrogenation ...the transfer hydrogenation of C=N bonds, with a particularly focus on reports from within the last 10 years and asymmetric ...of asymmetric ...
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Use of triazole ring formation to attach a Ru/TsDPEN complex for asymmetric transfer hydrogenation to a soluble polymer
... obtained using a Stuart Scientific Melting Point SMP1 and are ...measured using an Optical Activity ...obtained using a Perkin Elmer 8500 chromatograph linked to a PC running DataApex Clarity ...
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Synthesis of Allylic Amines by Asymmetric Transfer Hydrogenation of α,β-Unsaturated N-(tert-Butylsulfinyl)imines
... amine; asymmetric transfer hydrogenation; ATH; N-sulfinylimine; ruthenium catalyst; isopropyl ...and compounds known to display biological and pharmacological ...nitrogenated compounds, ...
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Asymmetric ruthenium tricarbonyl cyclopentadienone complexes ; synthesis and application to asymmetric hydrogenation of ketones
... IR Golden Gate. Mass spectra were recorded on a Bruker Esquire2000 or a Bruker MicroTOF mass spectrometer. Melting points were recorded on a Stuart Scientific SMP 1 instrument and are uncorrected. GC analysis was ...
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Spectrometric elucidation of intermediates in asymmetric transfer hydrogenation of ketones catalyzed by complex of ruthenium (II) and isosorbide-based ligand
... rhodium-catalyzed asymmetric transfer hydrogenation (ATH) of acetophenone using new chiral β-amino-alcohol 2 derived from isosorbide ...
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