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0343191329
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The presence of the corresponding regioisomeric C-4 product cannot be completely ruled out. However, accurate examination of the crude reaction product in each case indicated that the regioisomeric C-4 product is not present or is present to an extent not more than 3%
-
The presence of the corresponding regioisomeric C-4 product cannot be completely ruled out. However, accurate examination of the crude reaction product in each case indicated that the regioisomeric C-4 product is not present or is present to an extent not more than 3%.
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27
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0342756620
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3a,5 we tend to think that 3α should reasonably be a liquid
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3a,5 we tend to think that 3α should reasonably be a liquid.
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28
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0342756619
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The proton a to the methoxy group (the anomeric Ha proton, Scheme 3) in both the aziridines 8α and 21α shows a signal (dd) with intermediate values of the coupling constants (J=4.7 and 2.4 Hz in 8α and J=5.0 and 2.5 Hz in 21α) indicating an almost 1:1 equilibrium between the two conformers a and b
-
The proton a to the methoxy group (the anomeric Ha proton, Scheme 3) in both the aziridines 8α and 21α shows a signal (dd) with intermediate values of the coupling constants (J=4.7 and 2.4 Hz in 8α and J=5.0 and 2.5 Hz in 21α) indicating an almost 1:1 equilibrium between the two conformers a and b.
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31
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0003942864
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0343626287
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