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- W2122761921 abstract "New mono-quaternized allyl bromide salts of bis-Cinchona alkaloid ligands, [(QD)2PHAL-Allyl]Br and [(QN)2PHAL-Allyl]Br, have been synthesized which can be converted into their highly water-soluble multihydroxylated derivatives under asymmetric dihydroxylation (AD) conditions and, thus, easily recovered by a simple extraction method after reaction and reused. These mono-quaternized ligands exhibited superior catalytic efficiency to their neutral counterparts such as (DHQD)2PHAL and (DHQ)2PHAL for the AD reactions of mono- and disubstituted styrenes under Upjohn conditions. Merely 0.1 mol % of osmium was enough to complete the reactions of mono- and disubstituted styrenes and, moreover, these ligands showed the highest enantioselectivities (e.g., for styrene, 97 % ee with [(QD)2PHAL-Allyl]Br) among those ever achieved under Upjohn conditions." @default.
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- W2122761921 date "2006-12-01" @default.
- W2122761921 modified "2023-10-16" @default.
- W2122761921 title "New Mono-Quarternized Bis-Cinchona Alkaloid Ligands for Asymmetric Dihydroxylation of Olefins in Aqueous Medium: Unprecedented High Enantioselectivity and Recyclability" @default.
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- W2122761921 doi "https://doi.org/10.1002/adsc.200600253" @default.
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