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[求助] 跪求聚苯乙烯负载对甲苯磺酸催化剂的制备方法

大家好,请教一下,聚苯乙烯负载对甲苯磺酸的的合成方法是怎样的,是先合成聚苯乙烯后浸渍吗?文献上(如:Solvent-free sonochemical multi-component synthesis of benzopyranopyrimidines catalyzed by polystyrene supported p-toluenesulfonic acid,Tetrahedron,April 2015, Pages 2168–2176)用的这类催化剂都是直接从sigma购买的,找不到相应的合成方法。请各位赐教,最好有详细的方法,谢谢。@guozl
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