作者:Werner Abraham、Lutz Grubert、Ulrich W. Grummt、Karin Buck
DOI:10.1002/chem.200400243
日期:2004.7.19
Novel [2]rotaxanes containing the tetracationic cyclophane cyclobis(paraquat-4,4-biphenylene) and a dumbbell-shaped molecular thread incorporating a photoactive diarylcycloheptatriene station as well as a photoinactive anisol station have been synthesized with yields of nearly 50 % by the alkylative endcapping method. The rotaxane was transformed into the related rotaxane incorporating a diaryl tropylium
合成了新型的[2]轮烷,它含有四阳离子环庚基环双(百草枯-4,4-联苯)和结合了光敏二芳基环庚三烯站和光不活泼的苯甲醚站的哑铃状分子线,烷基化收率接近50%封端方法。轮烷通过电化学氧化转化为结合有二芳基托乙铵单元的相关轮烷。环庚三烯轮烷的前体,相关的假轮烷和结合有二芳基环庚三烯和相应的yl基单元的轮烷通过(1)HNMR光谱和UV / Vis光谱表征。根据NMR光谱,环庚三烯和对甲基轮烷都具有折叠的构象,使得四阳离子环烷能够与两个位置相互作用。二芳基环庚三烯站并入环烷的腔内,而苯甲醚站与环烷的联吡啶单元并排存在。相比之下,苯甲醚位在对甲基轮烷中的环烷内部。两种构象之间的交换可以通过将甲氧基离去基团引入到环庚三烯环中来实现。吡咯烷轮烷是通过这种甲氧基取代的轮烷的光杂解而产生的,它热反应回环庚三烯轮烷,从而关闭了转换循环。这些诱导的构象变化实现了所谓的分子机器。二芳基环庚三烯站并入环烷的腔内,而