New Mono-Quaternized Bis-Cinchona Alkaloid Ligands for Asymmetric Dihydroxylation of Olefins in Aqueous Medium: Unprecedented High Enantioselectivity and Recyclability.

New Mono-Quarternized Bis-Cinchona Alkal

New Mono-Quarternized Bis-Cinchona Alkaloid Ligands for Asymmetric Dihydroxylation of Olefins in Aqueous Medium: Unprecedented High Enantioselectivity and Recyclability

✍ Doo Seung Choi; Sang Seop Han; Eun Kyung Kwueon; Han Young Choi; Soon Ho Hwang; 📂 Article 📅 2006 🏛 John Wiley and Sons 🌐 English ⚖ 109 KB 👁 2 views

New mono-quaternized allyl bromide salts of bis-Cinchona alkaloid ligands, [(QD) 2 PHAL-Allyl]Br and [(QN) 2 PHAL-Allyl]Br, have been synthesized which can be converted into their highly water-soluble multihydroxylated derivatives under asymmetric dihydroxylation (AD) conditions and, thus, easily re