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37049069871
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18
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0042490180
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note
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Chiral properties of A are time- and temperature-dependent. Therefore we call this type of chirality "dynamic chirality". Half-life to racemization of A is 22 h at -78°C: see ref 4c.
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19
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0345022255
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Kawabata, T.; Yahiro, K.; Fuji, K. J. Am. Chem. Soc. 1991, 113, 9694-9697.
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Fuji, K.3
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20
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0033153536
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4b,7 and others, see: (a) Schmalz, H.-G.; Konig, C. B.; Bernicke, D.; Siegel, S.; Pflectschinger, A. Angew. Chem., Int. Ed. 1999, 38, 1620.
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Schmalz, H.-G.1
Konig, C.B.2
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Siegel, S.4
Pflectschinger, A.5
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21
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0033520303
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(b) Giese, B.; Wettstein, P.; Stähelin, C.; Barbosa, F.; Neuburger M.; Zehnder, M.; Wessig, P. Angew. Chem., Int. Ed. 1999, 38, 2586.
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Giese, B.1
Wettstein, P.2
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Neuburger, M.5
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Wessig, P.7
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22
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0033519678
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(c) Yashima, E.; Maeda, K.; Okamoto, Y. Nature 1999, 399, 449.
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Yashima, E.1
Maeda, K.2
Okamoto, Y.3
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24
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0042490179
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note
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3:acetone = 60:1), giving a mixture of 7 and 8 (94% yield). Recrystallization from ether-hexane gave diastereomerically and analytically pure 7.
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26
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85086351986
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note
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-1, R = 0.052.
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27
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0041989289
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note
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The stereochemistry of 11 and 12 was determined after their conversion to 7 and 8.
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28
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0041989290
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note
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Enolate E is not axially chiral along the C(2)-N axis even if the bond rotation is restricted at -78°C.
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