A series of trinuclear and dinuclear Cr(I)-N complexes bearing cyclopentadienyl-phosphine ligands were synthesized and characterized. Further reduction of the Cr(I)-N complexes generated anionic Cr(0)-N complexes, which could react with MeSiCl to afford the first chromium hydrazido complex from N functionalization. These complexes were found to be effective catalysts for the transformation of N into N(SiMe).
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http://dx.doi.org/10.1021/jacs.9b00822 | DOI Listing |
Acc Chem Res
November 2023
Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China.
ConspectusThe activation and functionalization of N to form nitrogen-element bonds have long posed challenges to industrial, biological, and synthetic chemists. The first transition-metal dinitrogen complex prepared by Allen and Senoff in 1965 provoked researchers to explore homogeneous N fixation. Despite intensive research in the last six decades, efficient and quantitative conversion of N to diazenido and hydrazido species remains problematic.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
October 2023
College of Chemistry, University of California Berkeley, Berkeley, CA 94720, USA.
This report describes the synthesis of a pseudo-tetrahedral chromium alkyne complex supported by a bidentate phosphinimide ligand and its reactivity with an azobenzene derivative. Characterization of the former by structural and computational methods reveals an unprecedented extent of alkyne activation by a formal chromium(II) center, suggesting that this complex is best described as a chromium(IV)-metallocyclopropene. Exposure of this compound to 4,4'-difluoroazobenzene results in the formation of a chromium(VI) diimido complex, which constitutes a rare 4-electron oxidative addition of an N=N double bond.
View Article and Find Full Text PDFJ Am Chem Soc
April 2023
Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China.
Isolation of key intermediate complexes in dinitrogen functionalization is crucial for elucidating the mechanistic details and further investigation. Herein, the synthesis and characterization of (μ-η:η-N)(η-N)-Cr(I) and (η-N)-Cr(0) complexes supported by Cp* (Cp* = CMe) and NHC ligands were reported. Further functionalization of Cr(0)-N complex with silyl halides delivered the key intermediates in the alternating pathway, the chromium diazenido complex and the chromium side-on η-hydrazido complex .
View Article and Find Full Text PDFJ Am Chem Soc
March 2019
Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry , Peking University, Beijing 100871 , China.
A series of trinuclear and dinuclear Cr(I)-N complexes bearing cyclopentadienyl-phosphine ligands were synthesized and characterized. Further reduction of the Cr(I)-N complexes generated anionic Cr(0)-N complexes, which could react with MeSiCl to afford the first chromium hydrazido complex from N functionalization. These complexes were found to be effective catalysts for the transformation of N into N(SiMe).
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