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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Iwai, Tomohiro Sawamura, Masaya Tanaka, Ryotaro Harada, Tomoya |
| Description | Author Affiliation: Iwai T ( Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810 (Japan), Fax: (+81) 11-706-3749 http://wwwchem.sci.hokudai.ac.jp/â ¼orgmet/index.php.) |
| Abstract | A silica-supported triphenylphosphane (Silica-3p-TPP) with a $Ph_{3}P-type$ core, immobilized on a silica surface, was synthesized and characterized by nitrogen-absorption measurements and solid-state NMR spectroscopy. The tripodal immobilization constrains the mobility of the phosphane molecule and causes the lone pair on the phosphorus atom to face in the direction perpendicular to the support, resulting in the selective formation of a 1:1 metal–phosphane species that is free from unfavorable steric repulsions caused by the silica surface. Heterogeneous Pd catalysts created in this manner enabled room-temperature Suzuki–Miyaura cross-coupling reactions with unactivated chloroarenes, despite the moderate electronic and steric nature of the $Ph_{3}P-based$ ligands. These catalysts also showed potential in reactions with more challenging substrates under mild conditions. Tripodally immobilized and well-dispersed phosphanes on the silica surface were crucial for high catalytic activity. |
| ISSN | 09476539 |
| e-ISSN | 15213765 |
| Journal | Chemistry - A European Journal |
| Issue Number | 4 |
| Volume Number | 20 |
| Language | English |
| Publisher | Wiley-VCH;ChemPubSoc Europe |
| Publisher Date | 2014-01-20 |
| Publisher Place | Germany |
| Access Restriction | Open |
| Subject Keyword | Chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Organic Chemistry Catalysis |
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