کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1322182 | 1499866 | 2015 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Copper(I) complexes of chelating imidazolo- and imidazolio-diphosphines Copper(I) complexes of chelating imidazolo- and imidazolio-diphosphines](/preview/png/1322182.png)
Resumption of the preparation of the known imidazolo-diphosphine BIPHIMIP allowed the resolution of its X-ray-crystal structure along with that of an imidazolo-triphosphine side-product. BIPHIMIP is then shown to undergo selective N-methylation to the corresponding imidazolio-diphosphine (BIPHIMIOP), also characterized by crystallography. In spite of weakly donating characters, both the neutral and cationic diphosphines are found to react with CuI to afford stable Cu(I) complexes occurring as centro-symmetric dinuclear species in the crystal state. Mild nucleophilic treatment of the electron-poor BIPHIMIOP complex with [Et4N][Cl] is shown to trigger dephosphinylation to the corresponding electron-rich NHC-phosphine complex, thus demonstrating the dative nature of the [N2C–PPh2]+ bond (in a NHC–>phosphenium adduct) and the C:–>P:–>Cu ternary character of the BIPHIMIOP-Cu coordination motif.
Chelation of Cu(I) centers by the electron-poor neutral BIPHIMIP and cationic BIPHIMIOP diphosphines is described, and the dicationic complex is shown to undergo dephosphinylation to the corresponding neutral electron-rich NHC-phosphine complex.Figure optionsDownload as PowerPoint slide
Journal: Journal of Organometallic Chemistry - Volume 776, 15 January 2015, Pages 149–152