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note
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2 for the specified time (Table 1). and the neutral products were separated by flash chromatography prior to assay
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29
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13344259566
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note
-
5 Due to the logarithmic nature of the calculation, as little as 5% undetected impurity, side reaction, racemization, or integral error (used to measure percent conversion) could account for the discrepancy in s values. At most, traces (< 1%) of racemization were detected by exposing 6e to zinc chloride + (PMP), or with added 3, or with PMP-HCl added (HPLC assay). Racemization cannot be ruled out, but error in percent conversion is the more likely source of the discrepancy. However, racemization of product ester or the recovered alcohol may explain why marginal results were obtained with the sensitive 1-(2-methoxyphenyl)-ethanol (maximum 15-30% ee for the ester as well as the recovered alcohol).
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85015578054
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0010382074
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The absolute configuration was assigned by chemical shift comparisons for the Mosher ester with data reported by Fuganti, et al.: Fuganti, C.; Grasselli, P.; Spreafico, F.: Zirotti, C.; Casati, P. J. Chem. Res., Synop. 1985, 22.
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