✦ LIBER ✦

Polymer immobilization of bis(oxazoline) ligands using dendrimers as cross-linkers

✍ Scribed by Enrique Dı́ez-Barra; José M Fraile; José I Garcı́a; Eduardo Garcı́a-Verdugo; Clara I Herrerı́as; Santiago V Luis; José A Mayoral; Prado Sánchez-Verdú; Juan Tolosa

Book ID: 104359685
Publisher: Elsevier Science
Year: 2003
Tongue: English
Weight: 189 KB
Volume: 14
Category: Article
ISSN: 0957-4166
DOI: 10.1016/s0957-4166(03)00074-0

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✦ Synopsis

Homopolymers of bis(oxazoline) ligands can be used to prepare efficient catalysts for cyclopropanation reactions. However, the low accessibility to most bis(oxazoline) moieties leads to a low copper loading. As a consequence, the transmission of chiral information from the complexed polymer is not very efficient and only a few chiral cyclopropane molecules are obtained from each molecule of chiral ligand. The use of suitable dendrimers as cross-linkers in the polymerization process allows better copper functionalization. As a consequence the productivity of chiral cyclopropanes per molecule of chiral ligand greatly increases, which improves the ligand economy and the chirality transfer.

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