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Preliminary communication: (a) Nakamura, M.; Hatakeyama, T.; Hara, K.; Fukudome, H.; Nakamura, E. J. Am. Chem. Soc. 2004, 126, 14344-14345.
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Preliminary communication: (a) Nakamura, M.; Hatakeyama, T.; Hara, K.; Fukudome, H.; Nakamura, E. J. Am. Chem. Soc. 2004, 126, 14344-14345.
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16
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56449117117
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When we used LDA in THF for deprotonation, the subsequent addition reaction was very slow. We assume that the diisopropylamine or THF slowed down the addition reaction through coordination to the zinc atom
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When we used LDA in THF for deprotonation, the subsequent addition reaction was very slow. We assume that the diisopropylamine or THF slowed down the addition reaction through coordination to the zinc atom.
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17
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0000450307
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The X-ray structure of the lithiated hydrazone has been reported (s- trans, as in SM6 in Figure 8). See: Collum, D. B.; Kahne, D.; Gut, S. A.; Depue, R. T.; Mohamadi, F.; Wanat, R. A.; Clardy, J.; Duyne, G. V. J. Am. Chem. Soc. 1984, 106, 4865-4869.
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The X-ray structure of the lithiated hydrazone has been reported (s- trans, as in SM6 in Figure 8). See: Collum, D. B.; Kahne, D.; Gut, S. A.; Depue, R. T.; Mohamadi, F.; Wanat, R. A.; Clardy, J.; Duyne, G. V. J. Am. Chem. Soc. 1984, 106, 4865-4869.
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18
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85102093305
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The rate of the addition reaction increased in the order THF < Et 2O < hexane. We assume that coordinative solvents prevent π-complex formation between the zincated hydrazone and alkenylboronates, such as in CP3 and CP4 in Figure 8
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2O < hexane. We assume that coordinative solvents prevent π-complex formation between the zincated hydrazone and alkenylboronates, such as in CP3 and CP4 in Figure 8.
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19
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CP1 is 1.8 kcal/mol lower in total electronic energy than SM1 + ethylene.
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CP1 is 1.8 kcal/mol lower in total electronic energy than SM1 + ethylene.
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34
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CP2 is 1.1 kcal/mol lower in total electronic energy than SM2 + ethylene.
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CP2 is 1.1 kcal/mol lower in total electronic energy than SM2 + ethylene.
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For MO analyses of organozinc reactions using localized molecular orbital (LMO) and natural bond orbital (NBO) methods, see: (a) Mori, S.; Hirai, A.; Nakamura, M.; Nakamura, E. Tetrahedron 2000, 56, 2804.
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We used the heptane polarity for the PCM calculation. The relative energies of TSA2-TSD2 obtained from the PCM calculation (B3LYP/631A) are 0, 2.37, 1.38, and 2.76 kcal/mol, respectively
-
We used the heptane polarity for the PCM calculation. The relative energies of TSA2-TSD2 obtained from the PCM calculation (B3LYP/631A) are 0, 2.37, 1.38, and 2.76 kcal/mol, respectively.
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