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34547169460
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30
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34547178277
-
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After ejecting the NMR tube, it was immediately cooled down in a liquid nitrogen bath before adding another equivalent of 1-phenyl-ethanol.
-
After ejecting the NMR tube, it was immediately cooled down in a liquid nitrogen bath before adding another equivalent of 1-phenyl-ethanol.
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34547190168
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A ReactIRTM 4000 from Mettler Toledo Autochem, Inc. was employed.
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A ReactIRTM 4000 from Mettler Toledo Autochem, Inc. was employed.
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64
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0012477017
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An alternative mechanism where the alkoxide dissociates followed by hydride transfer from noncoordinated alkoxide to ruthenium would give η5-ruthenium hydride 17 and free ketone. However, this mechanism is highly unlikely since the ç'-hydride reacts very slowly with ketones and even with 5 mol, of 17 it needs an induction period of 2.5 h for racemization.[5b,26b] Furthermore, the free ketone formed would undergo ketone exchange, which is not observed at room temperature; b related hydrides to 17 showed very low reactivity to benzaldehyde: C. P. Casey, T. E. Vos, S. W. Singer, I. A. Guzei, Organometallics 2002, 21, 5038-5046
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[5b,26b] Furthermore, the free ketone formed would undergo ketone exchange, which is not observed at room temperature; b) related hydrides to 17 showed very low reactivity to benzaldehyde: C. P. Casey, T. E. Vos, S. W. Singer, I. A. Guzei, Organometallics 2002, 21, 5038-5046.
-
-
-
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65
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26444594290
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The reduction of imines catalyzed by a hydroxycyclopentadienyl ruthenium hydride complex has been proposed to produce an amine which is trapped within the solvent cage: C. P. Casey, G. A. Bikzhanova, Q. Cui, I. A. Guzei, J. Am. Chem. Soc. 2005, 127, 14062-14071
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The reduction of imines catalyzed by a hydroxycyclopentadienyl ruthenium hydride complex has been proposed to produce an amine which is trapped within the solvent cage: C. P. Casey, G. A. Bikzhanova, Q. Cui, I. A. Guzei, J. Am. Chem. Soc. 2005, 127, 14062-14071.
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34547221523
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This ratio did not change with time, indicating that the equilibrium had been reached at this temperature
-
This ratio did not change with time, indicating that the equilibrium had been reached at this temperature.
-
-
-
-
68
-
-
34547219417
-
-
See Supporting Information for complete 1H NMR spectra
-
1H NMR spectra.
-
-
-
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69
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0001628903
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It is well known that electron-rich benzylic alcohols are oxidized faster than the electron-deficient ones; see for example: H.-D. Becker, A. Björk, E. Adler, J. Org. Chem. 1980, 45, 1596-1600;
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70
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0000787564
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for redox potential for the redox pair alcohol/ketone see
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