Diacetylenes are known to undergo solid-state topochemical polymerisation to give polydiacetylenes. The reactivity of the monomer is controlled by the arrangement of the molecules in the crystal lattice wherein certain parametric conditions must be met for 1,4-addition to proceed. In the present paper, we investigated the structure–reactivity relationship of a class of diacetylene monomers. Heteroaryl moieties such as thiophene, benzo[b]thiophene and quinoline as one or both directly bound side groups of a diacetylene backbone were used. Thus various symmetrical as well as unsymmetrical diacetylenes were prepared and characterised. The solid-state polymerisation behaviour of these diacetylenes was studied in the light of their single-crystal X-ray structure. It was found that in order to react in the solid state, the diacetylenes must have the required lattice parameters. However, even when the required lattice parameters are met, the diacetylene monomers do not necessarily undergo solid-state 1,4-addition polymerisation, implying the existence of further controlling factors to determine reactivity.
已知二
乙炔类化合物在固态下通过拓扑
化学聚合反应生成聚二
乙炔。单体的反应活性受晶体晶格中分子排列方式的控制,其中必须满足特定的参数条件才能进行1,4-加成反应。在本文中,我们研究了一类二
乙炔单体的结构-反应活性关系。使用了诸如
噻吩、苯并[b]
噻吩和
喹啉等杂环基团作为二
乙炔骨架的一个或两个直接连接的侧基。因此,制备并表征了各种对称及非对称的二
乙炔。根据这些二
乙炔的单晶X射线结构,研究了它们在固态下的聚合行为。研究发现,为了在固态下反应,二
乙炔必须具备所需的晶格参数。然而,即使满足了所需的晶格参数,二
乙炔单体也不一定会进行固态1,4-加成聚合,这意味着存在进一步的控制因素来决定反应活性。