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. Author manuscript; available in PMC: 2008 Jul 11.

Published in final edited form as: J Am Chem Soc. 2006 Jun 14;128(23):7594–7607. doi: 10.1021/ja0606024

(a) Relative ¹³C integrations in samples of 4 and the derived intramolecular ¹³C KIEs (25 °C), defined as (k_{12_C}/k_{13_C} at C1)/(k_{12_C}/k_{13_C} at C4) or (k_{12_C}/k_{13_C} at C2)/(k_{12_C}/k_{13_C} at C3). (b) Relative ¹³C integrations in samples of 7 and the derived intramolecular ¹³C KIEs (0 °C), defined as above. The numbers in parentheses refer to 95% confidence limits on the last digit.