The limit of strain energy differential for intramolecular nucleophilic substitution via a sulfonyl-stabilised carbanion to give cyclopropane analogues in hydroxylic solvents is around 160 kJ mol–1; above this level, concerted, albeit unactivated, 1,2-elimination is preferred.
在羟基溶剂中通过磺酰基稳定的碳负离子进行分子内亲核取代以得到
环丙烷类似物的应变能差的极限约为 160 kJ mol–1;高于该
水平,优选1,2-消除,尽管未激活,但一致。