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Effects of the halogenido ligands on the Kumada-coupling catalytic activity of [Ni{ t BuN(PPh2)2-κ2P}X2], X = Cl, Br, I, complexes.

ABSTRACT: Novel nickel(ii) complexes bearing ( t butyl)bis(diphenylphosphanyl)amine and different halogenido ligands, [Ni(P,P)X2] = [Ni{ t BuN(PPh2)2-κ2P}X2], (X = Cl, Br, I) are prepared, characterized by IR and NMR spectroscopy, mass spectrometry and X-ray crystallography, and tested as catalysts in the Kumada cross-coupling reaction of model substituted iodobenzenes and p-tolylmagnesium bromide. The data obtained together with DFT calculations indicate that these new catalysts operate in the Ni(i)-Ni(iii) mode. The highest catalytic activity and selectivity are exhibited by [Ni(P,P)Cl2], which is most easily reduced by the used Grignard reagent to the Ni(i) state. This process is much more energy demanding in the case of the bromido and iodido complexes, causing the appearance of the induction period. [Ni(P,P)Cl2] is also very active in the cross-couplings of substrates with iodine atoms sterically shielded by ortho substituents. The data obtained are in good accordance with the described positive effect of the increased electron-releasing power of N-substituents R' on the overall catalytic performance of [Ni{R'N(PPh2)2-κ2P}X2] complexes.

SUBMITTER: Ioannou PC 

PROVIDER: S-EPMC8979229 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature

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Effects of the halogenido ligands on the Kumada-coupling catalytic activity of [Ni{ <sup><i>t</i></sup> BuN(PPh<sub>2</sub>)<sub>2</sub>-κ<sup>2</sup>P}X<sub>2</sub>], X = Cl, Br, I, complexes.

Ioannou Polydoros-Chrysovalantis PC   Coufal Radek R   Kakridi Kalliopi K   Raptopoulou Catherine P CP   Trhlíková Olga O   Psycharis Vassilis V   Zedník Jiří J   Kyritsis Panayotis P   Vohlídal Jiří J  

RSC advances 20220114 4

Novel nickel(ii) complexes bearing ( <sup><i>t</i></sup> butyl)bis(diphenylphosphanyl)amine and different halogenido ligands, [Ni(P,P)X<sub>2</sub>] = [Ni{ <sup><i>t</i></sup> BuN(PPh<sub>2</sub>)<sub>2</sub>-κ<sup>2</sup>P}X<sub>2</sub>], (X = Cl, Br, I) are prepared, characterized by IR and NMR spectroscopy, mass spectrometry and X-ray crystallography, and tested as catalysts in the Kumada cross-coupling reaction of model substituted iodobenzenes and <i>p</i>-tolylmagnesium bromide. The data o  ...[more]

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