An achiral 3,5-bis(hydroxymethyl)phenylacetylene connected with a rigid and π-conjugated substituent was polymerized using a rhodium (Rh) complex catalyst in the presence of chiral 1-phenylethylamines. The circular dichroism (CD) spectra of the polymers indicated that an excess of one-handed helical polyacetylene backbone was induced by helix-sense-selective polymerization under the asymmetric conditions despite the achiral monomer. The split-type-induced CD signals at 300 nm were attributed to the chromophore including the conjugated side group since the signal appeared at a longer wavelength than the poly[3,5-bis(hydroxymethyl)phenylacetylene] without conjugated substituent.
在手性 1-苯基乙胺存在下,使用铑(Rh)络合物催化剂聚合了与刚性和 π 键合取代基连接的非手性 3,5-双(羟甲基)苯基乙炔。聚合物的圆二色性(CD)光谱表明,在不对称条件下,尽管存在非手性单体,但通过螺旋感应选择性聚合,诱导出了过量的单手螺旋聚乙炔骨架。在 300 纳米波长处出现的分裂型诱导 CD 信号归因于包括共轭侧基在内的发色团,因为信号出现的波长比没有共轭取代基的聚[3,5-双(羟甲基)苯乙炔]要长。