<i>Crypto</i>Cope Rearrangement of 1,3-Dicyano-5-phenyl-<i>4</i>,<i>4</i>-<i>d</i><sub>2</sub>-hexa-2,5-diene. Chameleonic or Centauric?
作者:W. von E. Doering、Yonghui Wang
DOI:10.1021/ja992137z
日期:1999.12.1
bond, reevaluation of the radical-stabilizing potential of the cyano group on secondary and allyl radicals, comparison with the (reevaluated) stabilizing effect of cyano in “nodal” positions of the Cope transition region, and determination of the enthalpy and entropy of activation of the cryptoCope rearrangement of otherwise Cope-incompetent, thermodynamically more stable hexa-2,5-dienes related by prototropy
用于评估自由基稳定扰动对 Cope 重排影响的“半人马座”模型推测取代基的独立作用,这些取代基对过渡区的两半提出了相互冲突的电子需求。该猜想的当前测试将 1,3-二氰基-[5-protio]-hexa-1,5-二烯 (1(H)) 和 2-苯基六-1,5-二烯与 1,3-二氰基- 5-苯基六-1,5-二烯 (1(Ph))。适当比较所需的热化学信息包括有关氰基与碳-碳双键共轭相互作用的 van't Hoff 型新数据、重新评估氰基在仲自由基和烯丙基自由基上的自由基稳定潜力、与(重新评估)氰基在 Cope 过渡区“节点”位置的稳定作用,