Levulinic acid (LA), a lignocellulosic biomass-derived compound has been recognized as one of the versatile building blocks for the synthesis of commodity chemicals having biofuel properties together with potential as precursor for the synthesis of several value-added pharmaceuticals and polymers. Herein, we report the synthesis of catalytically active functionalized porous organic polymer and its utilization as heterogeneous organocatalyst for the synthesis of EL from LA in very high yield. Here, sulfonic acid functionalized porous organic polymer SBZ@POP have been prepared via simple Friedel-Crafts alkylation of benzene with dimethoxymethane followed by sulfonation of the aromatic rings. The structure and properties of the material was examined through PXRD, N₂ sorption, HR TEM, ¹³C CP-MAS NMR, NH₃-TPD, TG-DTA and FTIR analysis. Our characterization data suggested nanoscale porosity with high surface acidity in SBZ@POP. The effects of reaction time, catalyst loading, molar ratio of levulinic acid to ethanol and reaction temperature were studied thoroughly to optimize the catalytic activity of SBZ@POP. Under optimized reaction conditions EL yield of 88 % has been achieved with 1:15 molar ratio of LA to ethanol under refluxing conditions in 10 h. This porous organic polymer based organocatalyst displayed good recyclability for consecutive five reaction cycles suggesting the sustainable application potential of this acidic organocatalyst.

左旋丙酸（LA）是一种木质纤维素生物质衍生的化合物，已被认为是合成具有生物燃料特性的商品化学品的通用构件之一，同时还具有合成多种增值药物和聚合物的潜力。在本文中，我们报道了催化活性官能化的多孔有机聚合物的合成及其作为非均相有机催化剂用于从LA合成EL的高产率。在此，磺酸的官能化多孔有机聚合物SBZ @ POP是通过苯与二甲氧基甲烷的简单Friedel-Crafts烷基化反应，然后对芳环进行磺化反应制备的。通过PXRD，N ₂吸附，HR TEM，¹³检查了材料的结构和性能C CP-MAS NMR，NH ₃ -TPD，TG-DTA和FTIR分析。我们的表征数据表明在SBZ @ POP中具有高表面酸性的纳米级孔隙度。深入研究了反应时间，催化剂用量，乙酰丙酸与乙醇的摩尔比和反应温度的影响，以优化SBZ @ POP的催化活性。在最佳反应条件下，在回流条件下，在10小时内，LA与乙醇的摩尔比为1：15，EL的收率达到88％。这种基于多孔有机聚合物的有机催化剂在连续五个反应循环中显示出良好的可回收性，表明该酸性有机催化剂的可持续应用潜力。