Long-Range Chiral Induction in Chemical Systems with Helical Organization. Promesogenic Monomers in the Formation of Poly(isocyanide)s and in the Organization of Liquid Crystals
作者:David B. Amabilino、Elena Ramos、José-Luis Serrano、Teresa Sierra、Jaume Veciana
DOI:10.1021/ja980474m
日期:1998.9.1
of the cholesteric phases, as well as to the helical senses of chiral smectic C phases, induced by the monomers in nematic and smectic C phases, respectively. Both relate to the odd−even rules for chiral sense changes in liquid crystalline phases. The role of noncovalent interactions in the polymerization has been proven by performing the reactions at various concentrations and in different solventsthe
报道了从手性前显微单体衍生的光学活性聚(异氰化物)的制备。值得注意的是,单体中的立体碳原子能够将其手性“信息”传递到距离它至少 14 个原子(约 16 A)的增长的聚合物主链上。这些构象刚性聚合物中的螺旋感应与胆甾相的螺旋感应以及手性近晶 C 相的螺旋感应进行比较,分别由向列和近晶 C 相中的单体诱导。两者都与液晶相中手性意义变化的奇偶规则有关。