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For transfer hydrogenative carbonyl allylations employing allyl acetate as allyl donor, see: Kim, I. S.; Ngai, M.-Y.; Krische, M. J. J. Am. Chem. Soc. 2008, 130, 6340.
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Formal substitution of alcohols by C-nucleophiles may be achieved under the conditions of hydrogen auto-transfer by way of oxidation-condensation- reduction. The alcohol-unsaturate couplings developed in our laboratory provide products of carbonyl addition, representing a formal C-H functionalization of the carbinol carbon. For recent reviews of hydrogen auto-transfer processes, see: (a) Guillena, G.; Ramon, D. J.; Yus, M. Angew. Chem., Int. Ed. 2007, 46, 2358.
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Formal substitution of alcohols by C-nucleophiles may be achieved under the conditions of hydrogen auto-transfer by way of oxidation-condensation- reduction. The alcohol-unsaturate couplings developed in our laboratory provide products of carbonyl addition, representing a formal C-H functionalization of the carbinol carbon. For recent reviews of hydrogen auto-transfer processes, see: (a) Guillena, G.; Ramon, D. J.; Yus, M. Angew. Chem., Int. Ed. 2007, 46, 2358.
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5-iridium complexes onto m-nitrobenzoate occurs at the para-position with respect to the nitro moiety: Kisenyi, J. M.; Sunley, G. J.; Cabeza, J. A.; Smith, A. J.; Adams, H.; Salt, N. J.; Maitlis, P. M. J. Chem. Soc., Dalton Trans. 1987, 2459.
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5-iridium complexes onto m-nitrobenzoate occurs at the para-position with respect to the nitro moiety: Kisenyi, J. M.; Sunley, G. J.; Cabeza, J. A.; Smith, A. J.; Adams, H.; Salt, N. J.; Maitlis, P. M. J. Chem. Soc., Dalton Trans. 1987, 2459.
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For selected examples of carboxylate assisted cyclometalation involving other transition metal complexes, see the following. Rhodium: (a) Ito, J.-I, Nishiyama, H. Eur. J. Inorg. Chem. 2007, 1114
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For selected examples of carboxylate assisted cyclometalation involving other transition metal complexes, see the following. Rhodium: (a) Ito, J.-I.; Nishiyama, H. Eur. J. Inorg. Chem. 2007, 1114
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Lafrance, M.; Fagnou, K. J. Am. Chem. Soc. 2006, 128, 16496. Carboxylate-assisted metalation of arenes exhibits acid-base character, requiring a certain level of electron deficiency at the carbon undergoing substitution. Our data suggest that cyclometalation of m-nitrobenzoic acid is especially facile due to the confluence of the following effects. The nitro moiety withdraws electron density through the π-system and the σ-framework, activating the positions ortho and para to the nitro moiety. The carboxy moiety assists ortho-metalation by reducing the entropy of activation and through enthalpic stabilization of the product through chelation.
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(d) Lafrance, M.; Fagnou, K. J. Am. Chem. Soc. 2006, 128, 16496. Carboxylate-assisted metalation of arenes exhibits acid-base character, requiring a certain level of electron deficiency at the carbon undergoing substitution. Our data suggest that cyclometalation of m-nitrobenzoic acid is especially facile due to the confluence of the following effects. The nitro moiety withdraws electron density through the π-system and the σ-framework, activating the positions ortho and para to the nitro moiety. The carboxy moiety assists ortho-metalation by reducing the entropy of activation and through enthalpic stabilization of the product through chelation.
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