4-diphenylhex-3-ene 1 is ring protonated in FSO3H·SbF5(1 : 1)-SO2ClF or in FSO3H·SbF5(4:1 )–SO2ClF superacid media and undergoes a rapid transannular cyclization eventually leading to mixtures of persistent phenanthrenium mono- and dications. The cofacial relationship of the phenyl groups is required for phenanthrenium ion formation. Low-temperature protonation of the corresponding (E)-stilbene 2gives But+ as
在FSO 3 H·SbF 5(1:1)-SO 2 ClF或FSO 3 H中将稠合的(Z)-2,2,5,5-四甲基-3,4-二苯基己基-3-烯1环质子化·SbF 5(4:1)–SO 2 ClF超酸介质,并经历快速的环过环化作用,最终导致持久存在的an和单药混合。
菲的离子形成需要苯基的表面关系。相应的(低温质子化ë) -
芪2给出卜吨+作为主要产物和芳族产物的复杂混合物。