thermal source of tricyclo[6.2.1.0 (2,7)]undec-9-en-11-ylidene (7), a typical foiled carbene. Species 7 can be trapped efficiently at 165 degrees C by electron-deficient alkenes like acrylonitrile and fumaronitrile whereby the anti addition products are obtained exclusively. Higher temperatures, however, favor intramolecular reactions. Density functional theory (DFT) calculations predict the formation of
螺恶二唑啉 5 是
三环 [6.2.1.0 (2,7)] undec-9-en-11-ylidene (7) 的清洁热源,这是一种典型的箔卡宾。物种 7 可以在 165 摄氏度下被
丙烯腈和
富马腈等缺电子烯烃有效捕获,从而专门获得抗加成产物。然而,较高的温度有利于分子内反应。密度泛函理论 (DFT) 计算预测两种反应物之间会形成强复合物,这实际上是自由能标度上的最小值。这些结果证实了箔卡宾的亲核特性和重排的显着障碍的存在。