Introduction of t-butyl groups to the 2-, 3-, 2,4-, or 2,5-positions of 7-t-butyl-7-cyano-1,3,5-cycloheptatriene dramatically shifts the cycloheptatriene - norcaradiene equilibrium to the norcaradiene form. The nonbonded interaction is an important factor.
将叔丁基引入7-叔丁基-7-
氰基-1,3,5-
环庚三烯的2-,3-,2,4-或2,5-位置显着改变了
环庚三烯-正
二十碳烯的平衡降为正二十碳六烯形式。非键相互作用是重要的因素。