Dipalladium Complexes with Triazolidin-Diylidene Bridges and Their Catalytic Activities
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https://figshare.com/articles/dataset/Dipalladium_Complexes_with_Triazolidin_Diylidene_Bridges_and_Their_Catalytic_Activities/2511334
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资源简介：
The 1,2,4-trimethyltriazolidin-3,5-diylidene (ditz) bridged
dipalladium
heterotetracarbene complex [PdBr2(iPr2-bimy)]2(μ-ditz) (3) (iPr2-bimy = 1,3-diisopropylbenzimidazolin-2-ylidene)
was prepared by Ag–carbene transfer involving the 1,2,4-trimethyltriazolium
dication (C), Ag2O, and the precursor complex
(iPr2-bimyH)[PdBr3(iPr2-bimy)] (2). Bromido substitution of 3 with AgO2CCH3 and AgO2CCF3 afforded the carboxylato
complexes [Pd(O2CCH3)2(iPr2-bimy)]2(μ-ditz) (4) and [Pd(O2CCF3)2(iPr2-bimy)]2(μ-ditz)
(5). Multinuclei NMR spectroscopies and X-ray diffraction
analyses showed that the all-trans isomers of 3, 4, and 5 are
the predominant products in all three cases. In addition, the decomposition
product of complex 4, trans-[Pd(O2CCH3)2(iPr2-bimy)2] (trans-6) was structurally determined by X-ray crystallography. A comparative
catalytic study revealed the superiority of complexes 3, 4, and 5 over the previously reported
mononuclear bis(benzimidazolin-2-ylidine) complexes without ditz bridges
in the Mizoroki–Heck coupling reaction. Overall, complex 4 bearing acetato coligands showed the best catalytic performance.
创建时间：
2012-06-25
