7782-51-6Relevant articles and documents
RHODIUM CATALYST AND METHOD FOR MANUFACTURING OPTICALLY ACTIVE COMPOUND USING THE SAME
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Paragraph 0024; 0025; 0026, (2017/01/05)
PROBLEM TO BE SOLVED: To provide a new rhodium complex stable in the air, easy in handling and using an inexpensive optically active H-phosphinate HP(O)R(OR') as a ligand, and a method for asymmetrically hydrogenating olefins efficiently using the same. SOLUTION: The rhodium complex compound has a structure represented by the following general formula (I). (Where in the formula (I), R1 and R2 are carbon substituents which may be the same or different, and two olefins coordinated in Rh may combine with each other as shown by a dotted line to form a ring structure.) COPYRIGHT: (C)2015,JPOandINPIT
Asymmetric hydrogenation of C=C double bonds using Rh-complex under homogeneous, heterogeneous and continuous mode conditions
Balogh, Szabolcs,Farkas, Gergely,Madarasz, Jozsef,Szoellsy, Aron,Kovacs, Jozsef,Darvas, Ferenc,Uerge, Laszlo,Bakos, Jozsef
supporting information; experimental part, p. 1146 - 1151 (2012/06/18)
A green process for enantioselective hydrogenation of dehydroamino acid derivatives and dimethyl itaconate with a rhodium catalyst modified by a new phosphine-phosphoramidite has been developed providing 97.7-99.8% enantioselectivity in green solvents such as ethylene carbonate and propylene carbonate. The l-DOPA precursor was obtained by simple filtration in 71% yield with 99.5% ee. Dimethyl itaconate was hydrogenated under solvent-free condition at 50 °C with 98.7% ee. The new rhodium complex was heterogenized on a mesoporous Al2O3 support using phosphotungstic acid (PTA) as an anchoring agent and tested in heterogeneous batch and flow reaction modes. The supported catalyst was reused eight times in the batch mode with over 97% ee and used over 12 hours in the flow reaction mode with an average of 97% ee in the asymmetric hydrogenation reaction of (Z)-α-acetamidocinnamic acid methyl ester.
NEW ORTHO-FUNCTIONALIZED P-CHIRAL ARYLPHOSPHINES AND DERIVATIVES: THEIR PREPARATION AND USE IN ASYMMETRIC CATALYSIS
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Page/Page column 21, (2010/07/04)
The invention relates to novel organo phosphorus P-chiral optically active compounds of formula (I) having a hydroxyl, mercapto, amino, carboxyl, sulfonyl group on aryl near a phosphorus atom, to the preparation and the use thereof in then asymmetrical catalysis of unsaturated compounds. Novel acylphosphine optically pure ligands embodied in the form of transition metal complexes exhibit an increased activity and enantloselectivity, in particular in asymmetrical hydrogenation, in comparison with the same type Uganda such as DiPAMP.