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Title

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

AuthorsDíez-Barra, Enrique; Fraile, José M. ; García, José I. ; Herrerías, Clara I. ; Mayoral, José A.
Issue Date2003
PublisherElsevier
CitationTetrahedron Asymmetry 14(7): 773-778 (2003)
AbstractHomopolymers 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. © 2003 Elsevier Science Ltd. All rights reserved.
URIhttp://hdl.handle.net/10261/64912
DOI10.1016/S0957-4166(03)00074-0
Identifiersdoi: 10.1016/S0957-4166(03)00074-0
issn: 0957-4166
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