A series of optically active helical poly[(S)-2-ethynyl-N-aliphatic acylpyrrolidine] were efficiently synthesized from a commercially available biomass-based starting material, and that bearing a short propionyl substituent exhibited an unexpected lower critical solution temperature in an aqueous solution with a narrow phase-transition window and a small hysteresis.

中文翻译：

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合成和螺旋聚乙炔的热响应行为脯氨酸衍生†

从市场上可买到的基于生物质的原料有效地合成了一系列旋光螺旋聚[（S）-2-乙炔基-N-脂族酰基吡咯烷]，带有短丙酰基取代基的化合物在室温下显示出出乎意料的较低的临界溶液温度。具有窄的相变窗口和小的滞后性的水溶液。