The preparations of
[2,2](3,3')biphenylparacyclophane-1,9-dine (19) and a dimethyl derivative (20)
synthesized by a ring-contraction procedure of the corresponding dithiacyclophanes (11) and (12) are reported. Both dienes (19) and (20) photocyclized
under oxidative conditions to the benzo[ghi]- perylenes (21) and (22).
Difficulties associated with the Stevens rearrangement in cyclophanes containing
a para-disubstituted benzene moiety have been rationalized in terms of a
competing ring- opening reaction. Several other reactions of the biphenylparacylophane ring system are reported, and the
stereochemistry of the macrocycle is discussed.
制备了
[2,2](3,3')
联苯副环烷-1,9-二ine (19) 和二甲基衍
生物 (20) 的制备方法。
报道了通过相应的二
硫代环烷 (11) 和 (12) 的缩环过程合成的 [2,2](3,3')
联苯副环烷-1,9-二ine (19) 和二甲基衍
生物 (20)。二烯(19)和(20)都在氧化条件下光环
在氧化条件下光环化成苯并[ghi]-
苝 (21) 和 (22)。
在含有对位二取代苯的环烷中,与史蒂文斯重排相关的困难是
在含有对位二取代苯分子的环烷中进行史蒂文斯重排所遇到的困难被合理地解释为
竞争开环反应。报告了
联苯副基环系统的其他几个反应,以及大环的立体
化学。
大环的立体
化学进行了讨论。