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- W2008137741 abstract "Abstract Phenyl ring 13 C NMR data for a series of tungsten(VI) phenylimido complexes, L 5 WNPh (L = Cl and OR) show that the position of the ipso carbon resonances varies with changes in the ancillary ligands L. X-ray crystal structure data for IW(NPh)OC- Me 3 ) 3 Cl(NH 2 CMe 3 )] and [W(NPh)(OEt 2 )(μ-OEt)- Cl] 2 , which have significantly different ipso carbon shifts, indicate that W-N π-bonding is weaker in the latter, as the complex relies less on π-electron density from the imido ligand to satisfy overall if-bonding requirements in attaining an 18-electron configuration. Changes in the shielding observed at the ipso carbon for the other complexes can also be related to W-N π-bonding variations. The para carbon shifts appear sensitive to inductive effects arising in the ancillary higands of the L5WN- substituent, becoming more shielded as the number of alkoxide groups increases over chloro ligands (decreasing −I effect) and as the number of methyl groups attached to the alkoxide ct-carbon increases (increasing +1 effect). The ortho carbons are generally shielded or de- shielded as found for the para carbons but to a lesser extent. Assessment of the data suggests π and σ components in the substituent may act independently to produce the variations in the chemical shifts observed." @default.
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- W2008137741 date "1987-10-01" @default.
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- W2008137741 title "Phenylimido complexes of tungsten(VI). The effects of ancillary ligand changes on phenyl ring 13C NMR resonance positions" @default.
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- W2008137741 doi "https://doi.org/10.1016/s0020-1693(00)87784-1" @default.
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