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- W2077282142 abstract "Treatment of the tetrafluorobenzyne complex Cp*Ir(η2-C6F4)(PMe3) (1) with MeCO2H affords the tetrafluorophenyl complex Cp*Ir(2,3,4,5,-C6F4H)(PMe3)(O2CMe) (2), which, on treatment with NaBH4, affords the hydride complex Cp*Ir(2,3,4,5,-C6F4H)(PMe3)H (3). Treatment of 3 with n-BuLi affords the trifluorobenzyne complex Cp*Ir(3,4,5-C6F3H)(PMe3) (4). Treatment of 4 with MeCO2H gives a mixture of two protonation products, Cp*Ir(2,3,4-C6F3H2)(PMe3)(O2CMe) (5) and Cp*Ir(3,4,5-C6F3H2)(PMe3)(O2CMe) (6) in an 8:1 ratio. Treatment of the 5/6 mixture with CF3CO2H affords 1,2,3-C6F3H3 and Cp*Ir(O2CCF3)2(PMe3) but at dramatically different rates, with 5 reacting significantly faster than 6. Treatment of 1a with Br2, I2, or MeI gives the oxidative addition products Cp*Ir(2-C6BrF4)Br(PMe3) (7), Cp*Ir(2-C6IF4)I(PMe3) (8), or Cp*Ir(2-C6MeF4)I(PMe3) (9), respectively. The variable-temperature proton NMR spectra of complexes 7 and 8 reveal an unusual restricted rotation about the Ir−PMe3 bonds on the NMR time scale (7, ΔG⧧ = 39 ± 2 kJ mol-1; 8, ΔG⧧ = 38 ± 2 kJ mol-1). Similarly, treatment of Cp*Rh(η2-C6F4)(PMe3) (1b) with I2 leads to formation of Cp*Rh(2-C6IF4)I(PMe3) (10), which also exhibits restricted rotation about the metal−phosphorus bond (ΔG⧧ = 44 ± 2 kJ mol-1). While the tetrafluorobenzyne complex (1a) is unreactive toward CO, the hydrocarbon analogue Cp*Ir(η2-C6H4)(PMe3) (1c) does react to give the CO monoinsertion product (11). Compound 1c also reacts with I2 to afford Cp*Ir(2-C6IH4)I(PMe3) (12), which also shows restricted rotation about the Ir−PMe3 bond (ΔG⧧ = 43 ± 2 kJ mol-1). X-ray crystal structures of complexes 3, 4, 5, 7, 8, 10, and 11 are reported." @default.
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- W2077282142 date "2003-03-29" @default.
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- W2077282142 title "Reactions of Iridium and Rhodium Complexes Containing η<sup>2</sup>-Benzyne, η<sup>2</sup>-Tetrafluorobenzyne, and η<sup>2</sup>-Trifluorobenzyne Ligands. Differential Rates of Arene Elimination by Protonation of Isomeric Fluoroaryl Complexes and Restricted Rotation of PMe<sub>3</sub> Ligands in <i>o</i><i>rtho-</i>Iodo and <i>o</i><i>rtho-</i>Bromoaryl Complexes" @default.
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- W2077282142 doi "https://doi.org/10.1021/om030048w" @default.
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