A dynamic supramolecular system exhibiting substrate selectivity in the catalytic epoxidation of olefins
作者:Stefán Jónsson、Fabrice G. J. Odille、Per-Ola Norrby、Kenneth Wärnmark
DOI:10.1039/b411978a
日期:——
A dynamic supramolecular system involving hydrogen bonding between a Mn(III) salen catalyst and a Zn(II) porphyrin receptor exhibitsselectivity for pyridine appended cis-beta-substituted styrene derivatives over phenyl appended derivatives in a catalytic epoxidation reaction.
Modulation of the reactivity, stability and substrate- and enantioselectivity of an epoxidation catalyst by noncovalent dynamic attachment of a receptor functionality—aspects on the mechanism of the Jacobsen–Katsuki epoxidation applied to a supramolecular system
作者:Stefán Jónsson、Fabrice G. J. Odille、Per-Ola Norrby、Kenneth Wärnmark
DOI:10.1039/b518244a
日期:——
The synthesis of the components of the dynamic supramolecular hydrogen-bonded catalytic system 2 + 3 is described. The catalytic performance and substrate- and enantioselectivity of Mn(salen) catalyst 2 were investigated in the presence and absence of the Zn(porphyrin) receptor unit 3. The effects of pyridine and pyridine N-oxide donor ligands were also studied. Some aspects on the mechanism of the