Tandem cheletropic additions of sulfur dioxide to [2.2.2]hericene. The ?barrelene effect?
作者:Jean-Luc Birbaum、Pierre Vogel
DOI:10.1002/hlca.19880710611
日期:1988.9.28
At 20°, [2.2.2]hericene ( = 2,3,5,6,7,8-hexamethylidenebicyclo[2.2.2]octane;1) adds 2 equiv. of SO2 to give successively mono-sulfolene 13 and the bis-sulfolene 14 (for thermodynamic and kinetic data, see Tables 1 and 2). Under forcing conditions (high concentration, long reaction time), no trace of tris-sulfolene 15 could be detected. The inertia of bis-sulfolene 14 is attributed to the ‘barrelene
在20°时,[2.2.2] ic烯(= 2,3,5,6,7,8-六亚甲基双环[2.2.2]辛烷; 1)加2当量。用SO 2连续得到单环丁砜13和双环丁砜14(关于热力学和动力学数据,参见表1和2)。在强力条件下(高浓度,长反应时间),无法检测到任何痕量的tris-sulfolene 15。双环丁砜14的惯性归因于“ barrelene效应”,其使三环丁烯砜15不稳定。