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• W2006361357 endingPage "3405" @default.
• W2006361357 startingPage "3398" @default.
• W2006361357 abstract "The reaction of the substrate [CpZr(CH2Ph)3] with the ligands 2,3,5,6-tetraphenyl- 1, 2-phenyl-4,6-di-tert-butyl- 2 or 2-(1-naphthyl)-4,6-di-tert-butyl-phenol 3 leads to the corresponding compounds [Cp(ArO)Zr(CH2Ph)2] 4–6. Solution studies show that naphthyl rotation is slow on the NMR timescale at ambient temperatures within 6 leading to non-equivalent benzyl groups with diastereotopic methylene protons. The solid-state structure of 5 shows both benzyl ligands to be η1-bound. Compounds 4–6 react with tert-butylisocyanide in hydrocarbon solvents to initially produce the mono(iminoacyl) derivatives [Cp(ArO)Zr(η2-ButNCCH2Ph)(CH2Ph)] 7–9 followed by the bis(iminoacyl) products [Cp(ArO)Zr(η2-ButNCCH2Ph)2] 10–12. In the solution 13C NMR spectra of the iminoacyl derivatives the Zr–CN carbon atom resonates at δ 242–244 ppm (7–9) and δ 229–234 ppm (10–12) consistent with the η2-C,N binding. This was confirmed in the solid state by X-ray diffraction studies of 8, 11 and 12. At ambient temperatures only one set of iminoacyl resonances are observed for 10 and 11, indicating that both iminoacyl rotation and aryloxide rotation are facile. At lower temperatures the iminoacyl ligands in 11 become non-equivalent in the 1H NMR spectrum consistent with restricted rotation about the Zr–O–Ar bond. The iminoacyl ligands in the 2-(1-naphthyl) derivative 12 are non-equivalent in solution NMR spectra from −75 to +85 °C. The solution fluxionality of these molecules as determined by NMR studies is discussed in detail." @default.
• W2006361357 created "2016-06-24" @default.
• W2006361357 creator A5007060871 @default.
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• W2006361357 creator A5057330382 @default.
• W2006361357 creator A5085107989 @default.
• W2006361357 date "2002-01-01" @default.
• W2006361357 modified "2023-10-16" @default.
• W2006361357 title "Synthesis, structure and molecular dynamics of η²-iminoacyl compounds [Cp(ArO)Zr(η²-Bu^tNCCH₂Ph)(CH₂Ph)] and [Cp(ArO)Zr(η²-Bu^tNCCH₂Ph)₂]" @default.
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• W2006361357 doi "https://doi.org/10.1039/b202244n" @default.
• W2006361357 hasPublicationYear "2002" @default.
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