将席夫碱锰配合物与硅钨酸结合制备出一种新颖的无机.有机杂化固体催化剂,通过红外光谱和热重表征数据推测出这种催化剂的组成和结构,并将其用于磷酸与等摩尔月桂醇酯化制备长链单烷基磷酸酯(MAP).结果表明,采用L~1-Mn-SiW(L~1:双水杨醛缩-1,6-己二胺)催化剂,在优化的反应条件下,酯化反应可获得93%的MAP收率和高达98%的MAP选择性.催化剂的重复使用测试表明,液-固多相酯化体系中该固体催化剂可方便地回收,且具有优异的稳定性,重复使用6次后催化剂活性未见下降,结构没有变化,是高效绿色催化剂.该催化剂作用下的磷酸酯化足固体碱催化过程.
Inorganic-organic hybrids were prepared by combining Schiff base complexes of manganese with silicotungstic acid (SiW). The composition and structure of the hybrid L~1-Mn-SiW (L~1: N,N'-disalicylidene-1,6-hexanediamine) were characterized by infrared spectros-copy and thermogravimetry. They were used as solid catalysts in the esterifieation of phosphoric acid with equimolar lanryl alcohol to monoalkyl phosphate ester (MAP). Over the L~1-Mn-SiW catalyst, the yield and selectivity for MAP were 93% and 98%, respectively, at the optimal reaction conditions. The catalyst exhibited excellent recoverability during a six-cycle test without any observable change of the catalyst structure. A base-catalyzed reaction route was proposed.
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