Abstract
Palladium ate complexes are frequently invoked as important intermediates in Heck and cross-coupling reactions, but so far have largely eluded characterization at the molecular level. Here, we use electrospray-ionization mass spectrometry, electrical conductivity measurements, and NMR spectroscopy to show that the electron-poor catalyst [L3Pd] (L=tris[3,5-bis(trifluoromethyl)phenyl]phosphine) readily reacts with Br- ions to afford the anionic, zero-valent ate complex [L3PdBr](-). In contrast, more-electron-rich Pd catalysts display lower tendencies toward the formation of ate complexes. Combining [L3Pd] with LiI and an aryl iodide substrate (ArI) results in the observation of the Pd-II ate complex [L2Pd(Ar)I-2](-).
Dokumententyp: | Zeitschriftenartikel |
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Fakultät: | Chemie und Pharmazie > Department Chemie |
Themengebiete: | 500 Naturwissenschaften und Mathematik > 540 Chemie |
ISSN: | 1433-7851 |
Sprache: | Englisch |
Dokumenten ID: | 54282 |
Datum der Veröffentlichung auf Open Access LMU: | 14. Jun. 2018, 09:55 |
Letzte Änderungen: | 04. Nov. 2020, 13:33 |