Abstract
Palladium complexes entrapped into zeolite cages have been prepared and characterised by MAS-NMR. They exhibit a high activity towards the Heck reaction of aryl bromides with olefins for small palladium concentrations (0.1 mol%). The catalysts can be easily separated from the reaction mixture and reused after washing without loss in activity. Except for very large complexes, no limitation to the diffusion of educts in the zeolite cages was observed. As for the homogeneous Heck reaction, the electronic nature of the aryl bromides and the olefins has a dominating effect on the reaction yield and selectivity. The heterogeneous catalysts activate even aryl chlorides under standard reaction conditions.
Original language | English |
---|---|
Pages (from-to) | 16-26 |
Number of pages | 11 |
Journal | Journal of Organometallic Chemistry |
Volume | 584 |
Issue number | 1 |
DOIs | |
State | Published - 10 Jul 1999 |
Keywords
- Aryl halides
- Entrapped complexes
- Heck olefination
- Heterogeneous catalysis
- Palladium
- Zeolite