Synthesis and Conformational Characteristics of Alkyl-Substituted Pillar[5]arenes
作者:Tomoki Ogoshi、Keisuke Kitajima、Takamichi Aoki、Shuhei Fujinami、Tada-aki Yamagishi、Yoshiaki Nakamoto
DOI:10.1021/jo100273n
日期:2010.5.21
pillar[5]arene derivatives with alkyl groups of different length were synthesized. The new alkyl-substituted pillar[5]arene derivatives 1,4-bis(ethoxy)pillar[5]arene (C2), 1,4-bis(propoxy)pillar[5]arene (C3), 1,4-bis(butoxy)pillar[5]arene (C4), 1,4-bis(pentyloxy)pillar[5]arene (C5), 1,4-bis(hexyloxy)pillar[5]arene (C6), and 1,4-bis(dodecanoxy)pillar[5]arene (C12) were obtained by Lewis acid-catalyzed condensation
合成了一系列具有不同长度的烷基的支柱[5]芳烃衍生物。新的烷基取代的支柱[5]芳烃衍生物1,4-双(乙氧基)支柱[5]芳烃(C2),1,4-双(丙氧基)支柱[5]芳烃(C3),1,4-双(丁氧基)立柱[5]芳烃(C4),1,4-双(戊氧基)立柱[5]芳烃(C5),1,4-双(己氧基)立柱[5]芳烃(C6)和1,4通过路易斯酸催化二烷氧基苯单体与低聚甲醛的缩合反应制得双(十二烷氧基)支柱[5]芳烃(C12)。通过动态支柱[5]芳烃衍生物的构象特性进行研究11 H NMR测量。当烷基取代基比甲基大时,柱[5]芳烃中酚单元的旋转受到抑制,其构象被固定。随着它们的长度增加,烷基取代基堆积在上下边缘,从而降低了柱[5]芳烃的构象自由度。