1 with the bis-hydroquinone that 1 gives when it is reduced. At room temperature, the nonracemic material forms a liquid crystalline phase, which upon heating becomes isotropic at 85 °C. Hexagonal columnar ordering in the pure material is demonstrated by X-ray diffraction, and columnar organization in dodecane solutions is indicated by all of the following increasing with concentration: the circular
Helicene 2b 可以通过将 1 与 1 还原时产生的双
氢醌结合形成的歧化产物酰化来制备。在室温下,非外消旋材料形成液晶相,加热后在 85 °C 时变为各向同性。X 射线衍射证明了纯材料中的六边形柱状排列,
十二烷溶液中的柱状组织由以下所有随浓度增加而表示:圆二色性、比旋光度、荧光发射位移和 1H NMR 屏蔽。该材料是第一个具有非外消旋螺旋核的柱状中间相。