Multicomponent polymerizations (MCPs) are a group of fascinating polymer synthesis approaches that are developed rapidly in the recent decade. As a popular alkyne‐based MCP, the A³‐polycouplings of alkynes, aldehydes, and amines are developed for the synthesis of poly(propargylamine)s under the catalysis of metal catalysts. In this work, through the design of carboxylic acid group‐activated alkyne monomers, a catalyst‐free, four‐component polymerization of propiolic acids, benzylamines, organoboronic acids, and formaldehyde is reported under mild condition at 45 °C in dichloroethane. This four‐component polymerization is applicable to different monomer structures, which can afford seven poly(propargylamine)s with up to 94% yields and molecular weights of up to 13 900 g mol⁻¹. Moreover, the poly(propargylamine)s demonstrate good solubility and processibility, high thermal stability and light refractivity, unique photophysical property, and so on. The simple monomers, mild condition, low cost, high efficiency, and procedure simplicity of this catalyst‐free four‐component polymerization demonstrates an elegant example of functional polymer synthesis.

中文翻译：

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丙酸，苄胺，有机硼酸和甲醛向功能性聚炔丙基胺的无催化剂四组分聚合

多组分聚合（MCP）是近十年来迅速发展的一组引人入胜的聚合物合成方法。作为一种流行的基于炔烃的MCP，开发了炔烃，醛和胺的A ³聚偶联剂，用于在金属催化剂的催化下合成聚炔丙基胺。在这项工作中，通过羧酸基团活化的炔烃单体的设计，报道了在温和条件下于45°C的二氯乙烷中，无催化剂的丙酸，苄胺，有机硼酸和甲醛的四组分聚合反应。这种四组分聚合反应适用于不同的单体结构，可以提供七种聚炔丙基胺，产率高达94％，分子量高达13900 g mol ^-1。此外，聚炔丙基胺显示出良好的溶解性和可加工性，高的热稳定性和光折射率，独特的光物理性质等。这种不含催化剂的四组分聚合反应的简单单体，温和的条件，低成本，高效率和操作简便性证明了功能聚合物合成的典范。