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Bis(oxazoline)-metal complexes immobilised by electrostatic interactions as heterogeneous catalysts for enantioselective Diels-Alder reactions

AuthorsFraile, José M. ; García, José I. ; Harmer, Mark A.; Herrerías, Clara I. ; Mayoral, José A.
Issue Date2001
CitationJournal of Molecular Catalysis A: Chemical 165(1-2): 211-218 (2001)
AbstractThe immobilisation by cationic exchange of complexes of a bis(oxazoline) with Cu(II), Mg(II) and Zn(II) has been studied with two types of anionic solid, a laponite clay and a nation-silica nanocomposite. The results obtained show that the cationic exchange depends on both the geometry of the complex and the nature of the cation. Whereas the immobilisation of square-planar complexes takes place easily, the situation is not the same for tetrahedral complexes. The solids prepared have been used as catalysts in a benchmark Diels-Alder reaction. These solids are efficient catalysts but the enantioselectivities are low, a fact that is related to the presence of non-chiral catalytic sites and to the nature of both the solid counter-ion and the bis(oxazoline) structure. © 2001 Elsevier Science B.V.
Identifiersdoi: 10.1016/S1381-1169(00)00423-4
issn: 1381-1169
Appears in Collections:(ICMA) Artículos
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