Electronic Structures of Nickel(II)-Bis(indanyloxazoline)-dihalide Catalysts: Understanding Ligand Field Contributions That Promote C(sp(2))-C(sp(3)) Cross-Coupling

0575712 - ÚFCH JH 2024 RIV US eng J - Journal Article
McNicholas, B. J. - Tong, Z. J. - Bím, D. - Turro, R. F. - Kazmierczak, N. P. - Chalupský, Jakub - Reisman, S. E. - Hadt, R. G.
Electronic Structures of Nickel(II)-Bis(indanyloxazoline)-dihalide Catalysts: Understanding Ligand Field Contributions That Promote C(sp(2))-C(sp(3)) Cross-Coupling.
Inorganic Chemistry. Roč. 62, č. 34 (2023), s. 14010-14027. ISSN 0020-1669. E-ISSN 1520-510X
Institutional support: RVO:61388955
Keywords : TETRAHEDRAL NICKEL(II) COMPLEXES * MAGNETIC CIRCULAR-DICHROISM * FUNCTIONAL THEORY APPROACH
OECD category: Physical chemistry
Impact factor: 4.6, year: 2022
Method of publishing: Limited access

NiII(IB) dihalide [IB = (3aR,3a′R,8aS,8a′S)-2,2′-(cyclopropane-1,1-diyl)bis(3a,8a-dihydro-8H-indeno[1,2-d]-oxazole)] complexes are representative of a growing class of first-row transition-metal catalysts for the enantioselective reductive cross-coupling of C(sp2) and C(sp3) electrophiles. Recent mechanistic studies highlight the complexity of these ground-state cross-couplings but also illuminate new reactivity pathways stemming from one-electron redox and their significant sensitivities to reaction conditions. For the first time, a diverse array of spectroscopic methods coupled to electrochemistry have been applied to NiII-based precatalysts to evaluate specific ligand field effects governing key Ni-based redox potentials. We also experimentally demonstrate DMA solvent coordination to catalytically relevant Ni complexes. Coordination is shown to favorably influence key redox-based reaction steps and prevent other deleterious Ni-based equilibria. Combined with electronic structure calculations, we further provide a direct correlation between reaction intermediate frontier molecular orbital energies and cross-coupling yields. Considerations developed herein demonstrate the use of synergic spectroscopic and electrochemical methods to provide concepts for catalyst ligand design and rationalization of reaction condition optimization. © 2023 American Chemical Society.
Permanent Link: https://hdl.handle.net/11104/0345453