Non-hydroxylic clathrate hosts of [4 + 2]π cycloadducts of phencyclone and N-arylmaleimides: recognition of aromatic guests
作者:Yasuyuki Yoshitake、Junichi Misaka、Koji Setoguchi、Masaki Abe、Tomohiro Kawaji、Masashi Eto、Kazunobu Harano
DOI:10.1039/b201915a
日期:——
A series of non-hydroxylic crystalline host compounds, [4 + 2]Ï cycloadducts of phencyclone and N-arylmaleimides having a bicyclo[2.2.1]heptene-7-one system, was synthesized and their inclusion behavior investigated. X-Ray crystal analyses of the inclusion compounds of the N-(1-naphthyl) derivative with butan-2-one, the N-(m-tolyl) derivative with p-xylene, together with the guest-free host and the N-(p-tolyl) derivative with m-xylene indicate that the âspaceâ surrounded by the phenanthrene ring, two phenyl rings and bridge carbonyl of the 1,3-diphenyl-1,3-dihydrocyclopenta[l]phenanthren-2-one moiety plays an important role, not only in the formation of inclusion complexes with the aromatic guests but also in hostâhost interactions. In every case, the N-aryl succinimide assists complex formation with the guests, in which the weak lattice forces due to CâHâ¯Ï
and CâHâ¯O interactions are operative. Methyl-substituted benzenes are effectively recognized by the CâHâ¯Ï interactions between the guest molecules and the phenanthrene ring of the hosts.
合成了一系列非羟基结晶主客体化合物,即含有二环[2.2.1]庚烯-7-酮体系的苯并环戊烯和N-芳基马来酰亚胺的[4 + 2]π环加成产物,并研究了它们的包埋行为。对N-(1-萘基)衍生物与丁酮、N-(m-甲苯基)衍生物与对二甲苯的包埋化合物,以及无客体的主客体和N-(p-甲苯基)衍生物与米二甲苯的X射线晶体分析表明,1,3-二苯基-1,3-氢环戊烯-2-酮部分中由菲环、两个苯环和桥碳酰基所包围的“空间”在与芳香族客体形成包埋复合物以及主客体之间的相互作用中发挥了重要作用。在每种情况下,N-芳基琥珀酰亚胺都有助于与客体的复合物形成,其中由于C–H⋯π和C–H⋯O相互作用而产生的微弱晶格力起作用。甲基取代的苯类化合物通过客体分子与主客体的菲环之间的C–H⋯π相互作用得到了有效识别。