期刊
NEW JOURNAL OF CHEMISTRY
卷 43, 期 28, 页码 11258-11262出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nj02555c
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资金
- Czech Science Foundation [17-02495S]
- Grant Agency of Charles University [130317]
- Charles University Research Centre program [UNCE/SCI/014]
Gold(i) phosphine complexes are often used in catalysis, but the role of their auxiliary ligands still remains poorly understood. Thus, building on our previous research, we prepared a series of Au(i) complexes [Au-2(mu-R(2)PfcCN)(2)][SbF6](2) (fc = ferrocene-1,1 '-diyl) to assess the effect of phosphine groups PR2 on the catalytic properties of these highly catalytically active, dimeric compounds. Catalytic testing in Au-mediated cyclisation of N-propargyl amides to 2-substituted 5-methyleneoxazolines showed that weaker donating phosphines gave rise to more active, albeit partly destabilised, catalysts. Nevertheless, thanks to their self-stabilisation by reversible nitrile coordination, [Au-2(mu-R(2)PfcCN)(2)](+) cations readily converted into catalytically active species (by dissociation) and, in addition, remained catalytically active even at very low metal loadings. The experimental results were supported by the trends in (1)J(PSe) coupling constants for R2P(Se)fcCN as a measure of ligand basicity, and by DFT calculations.
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