Area B: Catalysis
Area B of this CRC will be concerned with the probing of confinement effects and the development of a suitable linker technology to attach the catalyst within the pore.
The following catalyzed reactions, which are representatives for some of the most important transformations in organic chemistry, will be investigated in detail:
- Transfer Hydrogenation
- Olefin Metathesis
- Asymmetric 1,4- Addition
All the catalysts employed during the first funding period are well defined and established organometallic catalysts which have so far been used under homogeneous conditions. A fundamental mechanistic understanding of the homogeneous catalytic processes already exists, enabling us to gain full understanding of confinement effects.
Projects
„Inner-pore“-tethered tetraaza-ruthenium-complexes for the directed hydrogen-autotransfer catalysis
Principal Investigator: Prof. Dr. Bernd Plietker
Immobilized Molybdenum Imido, Tungsten Imido- and Tungsten Oxo Alkylidene N-Heterocyclic Carbene Complexes for Olefin Metathesis
Selected olefin metathesis reactions that are expected to be particularly susceptible to confinement effects will be studied. Both the influence of the pore surface (polar, non-polar, protic, aprotic) and the pore size, geometry and tortuosity of various mesoporous systems in combination with differently functionalized olefins (polar, non-polar, protic, aprotic) on the reactivity of N-heterocyclic carbene complexes of Mo-/W-imido- and W-oxo-alkylidenes immobilized in these mesoporous systems will be scrutinized.
Principal Investigator: Prof. Dr. Michael R. Buchmeiser
Asymmetric catalysis with supported chiral olefin-rhodium complexes in defined porous networks
The aim is to understand and control chirality transfer, catalytic activity and mechanism of chiral diene-metal complexes covalently tethered inside a mesoporous material by using the asymmetric Rh-catalyzed 1,4-addition of boronic acids to enones as a benchmark system. The confinement effects resulting from a) the steric confinement of the catalyst and substrate in a pore of certain size and geometry, b) the polarity gradient between the inner pore surface and the catalyst in the centre and c) solvent interactions with inner pore surface and the ligand sphere will be examined by various experimental and theoretical methods.
Principal Investigator: Prof. Dr. Sabine Laschat
