| Titel | N-Heterocyclic Carbene Palladium Pincer Complexes: Synthesis, Aggregations and Catalytic Applications |
|---|---|
| Autor | Jagadeesh Malineni |
| Publikationsform | Dissertation |
| Abstract | The work presented herein describes an investigation of a new class of pyridine-bridged bis- (benz)imidazolium salts and N-heterocyclic pincer carbene complexes derived there from, as well as their implication as homogenious catalysis in Heck and Suzuki cross coupling reactions and their aggregation to liquid crystals and organometallic gels. The novel pyridine bridged bis-benzimidazolylidene pincer palladium complex 6 is readily accessible by the amination of 2,6-difluoropyridine with benzimidazole, followed by N-alkylation with n-alkylhalide. The cyclometalation with palladium acetate under microwave conditions leads to palladium carbene complex 6. The palladium atom was strongly bound to two carbene molecules and coordinated with a pyridine molecule leading to the CNC carbene complex. The palladium carbene complex 6 is an efficient catalyst towards the Heck and Suzuki cross-coupling reactions even with catalyst loadings as low as 0.1 to 1 ppm. The scope of aryl halides as reaction proceeding is not significantly hampered by electronic or steric effects. The carbene complex is stable against air, moisture and high temperature. more... |
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| In Teilen | Inhaltsverzeichnis Teil 1. Seiten 1 - 85 (4,5 MB) Teil 2. Seiten 86 - 140 (5 MB) Teil 3. Seiten 141 - 158 (4,5 MB) Teil 4. Seiten 159 - 202 (4 MB) |