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An increase in the S/C to 500 caused a serious decrease in the ee value of the product possibly due to the substrate inhibition as observed in CH 3-CN
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3-CN.
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39649087671
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13C NMR and DEPT spectra at -50°C showed that the deprotonated anionic carbon resonates at δ 58.6 in 6b (anionic carbon for minor product 6a had not been observed), whereas the metal-bonded nitrile carbon atom appears between δ 135.2 and 140.2 in 6b and δ 137.1 and 139.2 in 6a, which is notably down-field shifted compared to free 4 (δ 116.0).
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