Polymeric cinchona alkaloids for the catalytic asymmetric dihydroxylation of olefins

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 👁 1 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

Silica Gel-Supported Cinchona Alkaloid-O

Silica Gel-Supported Cinchona Alkaloid-OsO4 Complex for Catalytic Heterogeneous Asymmetric Dihydroxylation of Olefins by H2O2 using a Titanium Silicalite-Based Coupled Catalytic System

✍ Boyapati M. Choudary; Naidu S. Chowdari; Karangula Jyothi; Sateesh Madhi; Mannep 📂 Article 📅 2002 🏛 John Wiley and Sons 🌐 English ⚖ 88 KB 👁 1 views

Sharpless Asymmetric Dihydroxylation of

Sharpless Asymmetric Dihydroxylation of Olefins in WaterSurfactant Media with Recycling of the Catalytic System by Membrane Nanofiltration

✍ Luis C. Branco; Frederico Castelo Ferreira; José L. Santos; João G. Crespo; Carl 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 457 KB 👁 1 views

Urea- and Thiourea-Substituted Cinchona

Urea- and Thiourea-Substituted Cinchona Alkaloid Derivatives as Highly Efficient Bifunctional Organocatalysts for the Asymmetric Addition of Malonate to Nitroalkenes: Inversion of Configuration at C9 Dramatically Improves Catalyst Performance.

✍ Séamus H. McCooey; Stephen J. Connon 📂 Article 📅 2005 🏛 John Wiley and Sons 🌐 English ⚖ 159 KB 👁 1 views

Urea- and Thiourea-Substituted Cinchona

Urea- and Thiourea-Substituted Cinchona Alkaloid Derivatives as Highly Efficient Bifunctional Organocatalysts for the Asymmetric Addition of Malonate to Nitroalkenes: Inversion of Configuration at C9 Dramatically Improves Catalyst Performance.

✍ Séamus H. McCooey; Stephen J. Connon 📂 Article 📅 2005 🏛 John Wiley and Sons 🌐 English ⚖ 158 KB 👁 1 views