作者:Herbert Meier、Matthias Lehmann、Hans Christof Holst、Dirk Schwöppe
DOI:10.1016/j.tet.2004.06.012
日期:2004.8
Star-shaped compounds, having a benzene (9a,b) or a 1,3,5-triazine (11a,b) core and stilbenoid arms were prepared. Hexyloxy chains, attached in the middle of the arms, provide nematic discotic phases ND, which are unusual for such systems. The position of the sidechains prevents the micro-segregation, which is valid for star-shaped discs of columnar phases. The stilbenoid character of 9a,b and 11a
制备了具有苯(9a,b)或1,3,5-三嗪(11a,b)核和类芪化合物臂的星形化合物。连接在臂中部的己氧基链提供向列盘状相N D,这对于这种系统是不常见的。侧链的位置可防止微偏析,这对于柱状相的星形圆盘有效。9a,b和11a,b的类贝类特征保证高感光度。除了在溶液中或在液相中通过辐射形成统计的CC键以外,还发现了处于结晶状态的拓扑化学控制的化学,区域和立体选择性光环二聚化11a → 12。12的结构确定基于不同的二维NMR技术(COSY,NOESY,HMQC,HMBC)。