A Generic Platform for Upcycling Polystyrene to Aryl Ketones and Organosulfur Compounds
A Generic Platform for Upcycling Polystyrene to Aryl Ketones and Organosulfur Compounds
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DOI：
10.1002/anie.202307042
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发表时间：
2023-07-24
影响因子：
16.6
通讯作者：
Liu，Guoliang
中科院分区：
文献类型：
--
作者：
Munyaneza，Nuwayo Eric;Posada，Carlos;Liu，Guoliang
由于泡沫产品体积庞大且存在相关污染物，聚苯乙烯 (PS) 是回收量最少的大批量商品塑料之一。由于缺乏经济激励、通用性有限以及现有方法的选择性差，PS 回收也受到严重阻碍。为此，我们在此报告了一种“降解-升级回收”的热化学回收策略，以从PS废物中合成具有高通用性和选择性的高价值芳香族化学品库。选择两个级联反应，首先在温和温度下将PS降解为苯，然后利用各种酰基/烷基和亚磺酰氯添加剂将其衍生化。为了证明其多功能性，制备了九种与化妆品和药物相关的酮和硫化物，包括苯丙酮、二苯甲酮和二苯硫醚。该方法还适用于复杂的升级循环反应设计，并且可以逐步生产所需的产品。这种简便且通用的方法将为将 PS 废物升级为增值化学品提供可扩展且有利可图的方法。
Polystyrene (PS) is one of the least recycled large‐volume commodity plastics due to bulkiness of foam products and associated contaminants. PS recycling is also severely hampered by the lack of financial incentive, limited versatility, and poor selectivity of existing methods. To this end, herein we report a thermochemical recycling strategy of “degradation‐upcycling” to synthesize a library of high‐value aromatic chemicals from PS wastes with high versatility and selectivity. Two cascade reactions are selected to first degrade PS to benzene under mild temperatures, followed by the derivatization thereof utilizing a variety of acyl/alkyl and sulfinyl chloride additives. To demonstrate the versatility, nine ketones and sulfides of cosmetic and pharmaceutical relevance were prepared, including propiophenone, benzophenone, and diphenyl sulfide. The approach is also amenable to sophisticated upcycling reaction designs and can produce desired products stepwise. The facile and versatile approach will provide a scalable and profitable methodology for upcycling PS waste into value‐added chemicals.