| Autor: |
Yuan, Jia, Zhu, Lizhao, Zhang, Jianying, Li, Jianfeng, Cui, Chunming |
| Zdroj: |
Organometallics; 20240101, Issue: Preprints |
| Abstrakt: |
The well-defined NHC-copper phosphides [(NHC)CuPPh2]3(1, NHC = 1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene (IiPr); 2, NHC = N,N-di-tert-butylimidazol-2-ylidene (ItBu)) have been prepared by the reaction of simple copper halides with HPPh2in the presence of N-heterocyclic carbenes (NHCs). Complexes 1and 2enabled catalytic double hydrophosphination of alkyl and aryl terminal alkynes to yield 1,2-diphosphinoethanes selectively in good yields. On the basis of these results, the most efficient and pratical in situ CuCl2/NHC catalyst has been developed. It catalyzes the selective double hydrophosphination of the alkynes with high efficiency and a wide substrate scope and exhibits even better performance than the well-defined NHC-Cu phosphides. The mechanistic studies disclosed that the formation of a copper acetylide in the catalytic cycle played an important role in the acceleration of the catalytic process. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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