Elimination Reactions of (<i>E</i>)- and (<i>Z</i>)-Benzaldehyde <i>O</i>-Pivaloyloximes. Transition-State Differences for the Syn and Anti Eliminations Forming Nitriles
作者:Bong Rae Cho、Nam Soon Cho、Sang Kook Lee
DOI:10.1021/jo9618637
日期:1997.4.1
value of 2.4 +/- 0.1, k(H)/k(D) = 2.7 +/- 0.3, DeltaH() = 12.5 +/- 0.2 kcal/mol, and DeltaS() = -31.0 +/- 0.6 eu have been determined. The corresponding values for 2 are rho = 1.4 +/- 0.1, k(H)/k(D) = 7.8 +/- 0.3, DeltaH() = 8.8 +/- 0.1 kcal/mol, and DeltaS() = -23.6 +/- 0.4 eu, respectively. The results indicate that the nitrile-forming anti eliminations from 2 proceed via a more symmetrical transition