Synthesis and extension/contraction motion of spiroborate-based double-stranded helicates consisting of substituted oligophenol strands
作者:Kazuhiro Miwa、Kaori Shimizu、Heejun Min、Yoshio Furusho、Eiji Yashima
DOI:10.1016/j.tet.2011.11.079
日期:2012.6
effect of the substitution position on the spiroborate-based double-stranded helicate formation with sodium borohydride was investigated. The ortho-substitution considerably hampered the spiroborate formation between the terminal biphenol units and the boron atoms, whereas the meta-substituted oligomers formed a double-stranded helicate bridged by spiroborate groups accommodating a sodium cation in
合成了一类新型的邻位和间位取代的四酚,其末端为苯基,中间为亚联苯基,研究了取代位置对硼氢化钠在螺硼酸酯基双链螺旋结构中的影响。的邻3'-取代大大妨碍了终端联苯酚单元和硼原子之间的spiroborate形成,而该元-取代的低聚物形成的双链helicate桥接由spiroborate组容纳在中心具有钠阳离子,其中所显示的延伸和收缩运动通过去除和添加溶液中的钠离子触发。