Ma, Baode published the artcileA new class of tunable dendritic diphosphine ligands. Synthesis and applications in the Ru-catalyzed asymmetric hydrogenation of functionalized ketones, Recommanded Product: (R)-[1,1′-Binaphthalene]-2,2′-diyl bis(trifluoromethanesulfonate), the publication is Chemistry – A European Journal (2014), 20(32), 9969-9978, database is CAplus and MEDLINE.
A series of tunable G0-G3 dendritic 2,2′-bis(diphenylphosphino)-1,1′-binaphthyl (BINAP) ligands was prepared by attaching polyaryl ether dendrons onto the four Ph rings on the P atoms. Their ruthenium complexes were employed in the asym. hydrogenation of β-keto esters, α-keto esters, and α-keto amides to reveal the effects of dendron size on the catalytic properties. The absolute configuration of (methyl(phenyl)amino)-1-oxo-butan-2-yl 4-bromobenzoate was determined by the single crystal x-ray diffraction anal. and its data were deposited at the Cambridge Crystallog. Data Center as supplementary publication number CCDC 987977. The second- and third-generation catalysts exhibited excellent enantioselectivities, which are remarkably higher than those obtained from the small mol. catalysts and the first-generation catalyst. Mol. modeling indicates that the incorporation of bulky dendritic wedges can influence the steric environments around the metal center. In addition, the ruthenium catalyst bearing a second-generation dendritic ligand could be recycled and reused seven times without any obvious decrease in enantioselectivity.
Chemistry – A European Journal published new progress about 126613-06-7. 126613-06-7 belongs to esters-buliding-blocks, auxiliary class Chiral Diphenols, name is (R)-[1,1′-Binaphthalene]-2,2′-diyl bis(trifluoromethanesulfonate), and the molecular formula is C22H12F6O6S2, Recommanded Product: (R)-[1,1′-Binaphthalene]-2,2′-diyl bis(trifluoromethanesulfonate).
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