The Thermal Transformations of Bicyclopropylidene and Methylenespiropentane Revisited
作者:Heiko Schill、Sergei I. Kozhushkov、Robin Walsh、Armin de Meijere
DOI:10.1002/ejoc.200601100
日期:2007.3
The overall and the individual rate constants of the unimolecular thermal isomerization of methylenespiropentane (4) to 1,2- and 1,3-dimethylenecyclobutanes (7 and 8) have been determined to be lg (k–4/s–1) = (13.78 ± 0.06) – (49.7 ± 0.2) kcal mol–1/RT·ln 10, lg (k7/s–1) = (13.03 ± 0.19) – (48.0 ± 0.6) kcal mol–1/RT·ln 10 and lg (k8/s–1) = (14.15 ± 0.19) – (52.4 ± 0.5) kcal mol–1/RT·ln 10, respectively
亚甲基螺戊烷 (4) 到 1,2- 和 1,3- 二亚甲基环丁烷 (7 和 8) 的单分子热异构化的整体和单个速率常数已确定为 lg (k–4/s–1) = ( 13.78 ± 0.06) – (49.7 ± 0.2) kcal mol–1/RT·ln 10, lg (k7/s–1) = (13.03 ± 0.19) – (48.0 ± 0.6) kcal mol–1/RT·ln 10 和lg (k8/s–1) = (14.15 ± 0.19) – (52.4 ± 0.5) kcal mol–1/RT·ln 10,分别。活化能明显低于母体螺戊烷重排的活化能。 (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)