期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 25, 期 9, 页码 2352-2357出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201805540
关键词
ligand design; phosphines; proton-responsive ligands; strong donor; switchable donor strength
资金
- DFG [DI 2054/1-1, SFB 858]
Stimuli-responsive ancillary ligands are valuable tools to control the activity and selectivity of transition-metal catalysts. The synthesis and characterization of a series of metal complexes containing phosphines with proton-responsive imidazolin-2-ylidenamino substituents are reported. Determination of the ligand-donor properties revealed that protonation of each substituent increases the Tolman electronic parameter (TEP) of the phosphine by 22 cm(-1), hence allowing for switching of the electron-donor power of phosphine 2 within an unprecedented range (Delta TEP = 43.4 cm(-1)).
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