Please use this identifier to cite or link to this item:
|Title:||1,2,3-triazolin-5-ylidenes: Synthesis of hetero-bis(carbene) Pd(II) complexes, determination of donor strengths, and catalysis|
|Citation:||Yuan, D., Huynh, H.V. (2012-01-09). 1,2,3-triazolin-5-ylidenes: Synthesis of hetero-bis(carbene) Pd(II) complexes, determination of donor strengths, and catalysis. Organometallics 31 (1) : 405-412. ScholarBank@NUS Repository. https://doi.org/10.1021/om2010029|
|Abstract:||A series of hetero-bis(carbene) complexes trans-[PdBr 2( iPr 2-bimy)(trz)] 1-4 ( iPr 2-bimy = 1,3-diisopropylbenzimidazolin-2-ylidene; trz = 1,2,3-triazolin-5-ylidene) bearing the constant iPr 2-bimy and varying mesoionic 1,2,3-triazolin-5-ylidenes with different N-substituents has been synthesized as complex probes. Their 13C NMR spectroscopic evaluation shows that mesoionic 1,2,3-triazolin-5-ylidenes are, in general, stronger donors than classical NHCs, while weaker than some nonclassical NHCs, such as pyrazolin-3-ylidenes and mesoionic imidazolin-4-ylidenes. More importantly and for the first time, this methodology proves useful in establishing substituent effects in the donating abilities of 1,2,3-triazolin-5-ylidenes on a finer level. In addition, the trifluoroacetato analogues [Pd(O 2CCF 3) 2( iPr 2-bimy)(trz)] 5-7 have been synthesized through salt metathesis of 1, 2, and 4 with AgO 2CCF 3. The catalytic activities of complexes 1, 2, and 4-7 were examined in the direct arylation of pentafluorobenzene. Complexes bearing less donating trz ligands perform better in this catalysis, and trifluoroacetato complexes outperformed their bromido analogues. © 2011 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 Jan 22, 2019
WEB OF SCIENCETM
checked on Jan 14, 2019
checked on Jan 12, 2019
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.