Matches in SemOpenAlex for { <https://semopenalex.org/work/W2017023377> ?p ?o ?g. }
- W2017023377 endingPage "9429" @default.
- W2017023377 startingPage "9420" @default.
- W2017023377 abstract "Optimized syntheses for 1,3-dimesitylnaphthoquinimidazolium chloride [1H][Cl] and the corresponding silver−NHC complex [AgCl(1)] (2) were developed, enabling access to this versatile reagent in near-quantitative yield. Transmetalation from 2 to [NiCl2(PPh3)2], trans-[PdCl2(PhCN)2], or trans-[PtCl2(PhCN)2] afforded the Group 10 complexes trans-[MCl2(1)2] (3a−c, M = Ni, Pd, and Pt, respectively) in excellent overall yield (>95%) after three steps from commercially available starting materials. Electrochemical measurements indicated that the E1/2 and ΔE1/2 values for the quinone reduction couples were independent of the identity of the bridging transition metal in these complexes. Whereas attempts to isolate the reduced complexes were unsuccessful, UV/vis spectroelectrochemical analysis confirmed that electrochemical reduction of 3a−c in situ afforded optical difference spectra consistent with the formation of the expected reduced species. Complex 3a was found to catalyze the Kumada cross-coupling reaction between PhMgCl and a range of bromoarenes at room temperature. Addition of 2 equiv of cobaltocene (with respect to 3a) to the coupling reaction with bromotoluene caused a decrease in catalytic activity (from 4.7 × 10−5 to 2.7 × 10−6 s−1), which was attributed to the conversion of 3a to an arrested state. Subsequent introduction of ferrocenium tetrafluoroborate (2 equiv with respect to 3a) restored a significant degree of catalytic activity (kobs = 1.2 × 10−5 s−1). Redox-switching experiments performed over different time scales revealed that the catalyst was stable in the reduced/inactive state and that extended durations in this state did not impede catalytic reactivation upon subsequent oxidation." @default.
- W2017023377 created "2016-06-24" @default.
- W2017023377 creator A5001289712 @default.
- W2017023377 creator A5079868859 @default.
- W2017023377 creator A5084310453 @default.
- W2017023377 date "2010-06-18" @default.
- W2017023377 modified "2023-10-01" @default.
- W2017023377 title "Arrested Catalysis: Controlling Kumada Coupling Activity via a Redox-Active N-Heterocyclic Carbene" @default.
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