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. Author manuscript; available in PMC: 2015 Jun 30.
Published in final edited form as: J Am Chem Soc. 2002 Sep 25;124(38):11417–11428. doi: 10.1021/ja012555f

Table 5.

Activation Parameters and 275 K kex for 2-RCN, 2-py4−tBu, and 1-py4−tBu

kex275 (sec−1) ΔH‡ (kcal/mol) ΔS‡ (eu) Ea (kcal/mol)
2-MeCN 8.50(2) × 104 7.1(8) −10(1) 7.3(8)
2-PhCN 3.27(2) × 104 4.9(8) −20(3) 5.3(9)
2-iPrCN 3.27(2) × 104 5.4(6) −17(2) 6.0(7)
2-py4−tBu 3.56(3) × 104 5(1) −18(2) 6(1)
1-py4−tBu 1.19(3) × 105 3.1(8) −25.8(3) 3.7(9)