The synthesis and characterization through NMR and X-ray crystallography of a series of N-arylpyridiniophosphines and their corresponding Au(I)-derivatives are reported. Because of their acceptor properties, pyridiniophosphines efficiently enhance the electrophilicity of the Au atom in the complexes they form. In our study, this is translated into higher reactivity of the corresponding Au catalysts, which is demonstrated in two mechanistically differentiated cycloisomerizations. Moreover, the steric protection and probably also the electronic stabilization provided by the N-aryl substituents make the active Au-species more robust and slow down its rate of decay. This allows for an appreciable reduction of the catalyst loadings.

中文翻译：

---

N-芳基吡啶碘膦：合成，结构及其在Au（I）催化中的应用

报道了通过NMR和X射线晶体学对一系列N-芳基吡啶碘膦及其相应的Au（I）衍生物的合成和表征。由于它们的受体特性，吡啶碘膦有效地增强了它们形成的络合物中Au原子的亲电性。在我们的研究中，这转化为相应的Au催化剂具有更高的反应活性，这在两种机理上不同的环异构化过程中得到了证明。此外，由N-芳基取代基提供的空间保护以及可能的电子稳定作用使活性Au物种更牢固，并减缓了其衰减速率。这可以显着降低催化剂的负载量。