ChemInform Abstract: An Improved Heterogeneous Asymmetric Epoxidation of Homoallylic Alcohols Using Polymer-Supported Ti(IV) Catalysts.

✍ Scribed by Jaana K. Karjalainen; Osmo E. O. Hormi; David C. Sherrington

• Publisher: John Wiley and Sons
• Year: 2010
• Weight: 31 KB
• Volume: 30
• Category: Article
• ISSN: 0931-7597
• DOI: 10.1002/chin.199916045

✦ Synopsis

An Improved Heterogeneous Asymmetric Epoxidation of Homoallylic Alcohols Using Polymer-Supported Ti(IV) Catalysts.

-Polyesters with different degrees of branching/crosslinking, prepared by condensation polymerization of L-tartaric acid and 1,8-octanediol, are applied as ligands in the Ti(IV)-catalyzed epoxidation of four different homoallylic alcohols. Although the reactions are found to proceed much better using roughly stoichiometric levels of catalysts, the system remains catalytic. The enantioselectivities (30-80%) and chemical yields (up to 75%) obtained are significantly higher than with monomeric tartrate ligands. -(KARJALAINEN, JAANA K.; HORMI,