Abstract
While the Heck coupling of aryl bromides with styrenes by palladium acetate entrapped within octylated silica sol-gel forms almost entirely trans-stilbenes, the catalysis by the palladium compound within the cis-pre-imprinted support gives stilbenes that are substantially enriched by cis-oriented isomers. Although the ceramic support is completely freed from the imprint prior to the coupling process, cis-stilbenes are formed with similar selectivities upon recycling of the catalyst systems for at least four consecutive runs.
Original language | American English |
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Pages (from-to) | 2856-2858 |
Number of pages | 3 |
Journal | Advanced Synthesis and Catalysis |
Volume | 350 |
Issue number | 18 |
DOIs | |
State | Published - Dec 2008 |
Keywords
- C-C coupling reactions
- Heterogeneous catalysis
- Imprinting
- Sol-gel process
- Stereoselectivity