New Polymer Supported Cinchona Alkaloids for Heterogeneous Catalytic Asymmetric Dihydroxylation of Olefins
โ Scribed by E Nandanan; A Sudalai*; T Ravindranathan*
- Book ID
- 104256773
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- French
- Weight
- 443 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0040-4039
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Heterogeneous Catalytic Asymmetric Aminohydroxylation of Olefins Using Polymer-Supported Cinchona Alkaloids. -The first heterogeneous asymmetric aminohydroxylation catalyzed by OsO 4 using polymer supported cinchona alkaloid is reported. However, the reactions only proceed with moderate enantiosele
The need for catalyst systems for the asymmetric dihydroxy-polymer or silica gel. After catalysis the ligands can easily be recycled by simple filtration. (b) The alkaloids are anchored lation of olefins (AD) that combine the positive characteristics of the original homogeneous osmium catalysts with
Comparable reactivity and enantioselectivity to those in homogeneous solution have been achieved in heterogeneous catalytic asymmetric dihydroxylation (AD) of olefins using a new silica gel supported cinchona alkaloid containing 1,4-bis(9-Oquininyl)phthalazine ((QN)2-PHAL). Moreover, the silica supp