Please use this identifier to cite or link to this item:
|Title:||Palladium(II) pyrazolin-4-ylidenes: Substituent effects on the formation and catalytic activity of pyrazole-based remote NHC complexes|
|Authors:||Han, Y. |
|Citation:||Han, Y., Lee, L.J., Huynh, H.V. (2009-05-11). Palladium(II) pyrazolin-4-ylidenes: Substituent effects on the formation and catalytic activity of pyrazole-based remote NHC complexes. Organometallics 28 (9) : 2778-2786. ScholarBank@NUS Repository. https://doi.org/10.1021/om8010849|
|Abstract:||Three 4-iodopyrazolium salts with 3,5-dimethyl (3a), 3,5-diphenyl (3b), and 3,5-diisopropyl (3c) substituents, respectively, were synthesized using a modular approach. The oxidative addition of 3a-c to Pd2(dba) 3/PPh3 afforded products (trans-4a, cis-/trans-4b and 4c) of different geometries or connectivities, indicating a dramatic substituent effect on the formation of pyrazolin-4-ylidene complexes. In addition, the reactions of 3a-c with Pd2(dba)3 in the presence of pyridine yielded new mixed pyrazolin-4-ylidene/pyridine complexes (5a-c). All complexes have been fully characterized by multinuclear NMR spectroscopies, ESI mass spectrometry, and X-ray diffraction analyses. Furthermore, an initial catalytic study on Suzuki-Miyaura and Mizoroki-Heck cross-coupling reactions also reveals a significant substituent effect on catalytic activities. © 2009 American Chemical Society.|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Jul 14, 2018
WEB OF SCIENCETM
checked on Jun 19, 2018
checked on Jun 14, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.