Abstract
Silica-supported, bimetallic palladium-copper catalysts were prepared in solution under mild conditions by reacting lithium di(4-tolyl)cuprate with palladium acetate in the presence of silica particles. Small bimetallic palladium-copper particles were deposited on the silica surface as confirmed with TEM-EDAX and EXAFS. The new material has been applied as catalyst in the liquid-phase semihydrogenation of mono- and disubstituted alkynes and showed high selectivity toward the cis-alkenes. The influence of addition of quinoline or potassium hydroxide to the semihydrogenation reaction mixture and the effects of exposure of the catalyst to air before use have been investigated.
| Original language | Undefined/Unknown |
|---|---|
| Pages (from-to) | 1647-1656 |
| Number of pages | 10 |
| Journal | Journal of Organic Chemistry |
| Volume | 66 |
| Issue number | 5 |
| Publication status | Published - 2009 |