Synthesis and Inclusion Properties of Carbonyl-Bridged Analogs of Acyclic<i>p</i>-<i>t</i>-Butylphenol–Formaldehyde Oligomers
作者:Yoshihiro Ohba、Keisaku Irie、Fu Sheng Zhang、Tyo Sone
DOI:10.1246/bcsj.66.828
日期:1993.3
A series of compounds in which a part or all of the methylene bridges of acyclic p-t-butylphenol–formaldehyde oligomers are replaced by C=O bridge(s) has been synthesized. The carbonyl-bridged tetramers, except for that with no methylene bridge, formed crystalline host–guest complexes with various organic compounds; those with two C=O bridges were superior regarding complexation, regardless of the position of the bridges. Exclusive guest selectivity of the tetramer with one terminal C=O bridge was observed for benzene and its methyl derivatives in a two-component system. The fully carbonyl-bridged dimer, trimer, tetramer, and pentamer had no complexing-capability. The thermal stability of benzene complexes (host : guest = 2 : 1) of the tetramers with one C=O bridge, as estimated from their thermal dissociation rates, are remarkably lower than that of the parent tetramer. Oximes derived from the tetramers with one C=O bridge were much more effective than the corresponding carbonyl-bridged ones regarding their complex-forming capability.
我们合成了一系列无环对叔丁基苯酚-甲醛低聚物的部分或全部亚甲基桥被 C=O 桥取代的化合物。除了没有亚甲基桥的四聚体外,其他羰基桥四聚体都能与各种有机化合物形成结晶的主客体络合物;无论桥的位置如何,具有两个 C=O 桥的四聚体在络合方面都更胜一筹。在双组分体系中,有一个末端 C=O 桥的四聚体对苯及其甲基衍生物具有独特的客体选择性。完全羰基桥接的二聚体、三聚体、四聚体和五聚体没有络合能力。根据热解离率估算,有一个 C=O 桥的四聚体的苯络合物(主:客=2:1)的热稳定性明显低于母体四聚体。在形成络合物的能力方面,由具有一个 C=O 桥的四聚体衍生出的肟要比相应的具有羰基桥的四聚体有效得多。