Dawson结构三取代杂多酸盐催化乙酸正丁酯

合成了Dawson结构三取代杂多磷钨酸盐：Na18P2W15M3O62]（M=Fe、Co、Cu、Ni），并利用红外光谱、紫外光谱对其结构进行表征，从红外数据可以看出这4种杂多化合物在700—1100cm^-1处有4个特征峰，从紫外数据可以看出这4种杂多化合物在200nm和290nm左右存在2个吸收峰，这些结果表明；它们均具有Dawson结构；并且利用它们催化合成乙酸正丁酯，确定了最佳反应条件：酸醇物质的量比为1：1；催化剂用量占总量的1％；最佳反应时间为5h；考察了它们的催化性能，其催化活性为：Na18P2W15Ni3O62]〉Na18P2W15Co3O62]〉Na18P2W15Fe3O62]〉Na18P2W15Cu3O62]。

Synthesis of Ethyl Acetate by Tri-substituted Heteropoly Acid with Dawson Structure

Tri - substituted heteropoly acids with Dawson structure： Na18 P2W15M3O62 ] （M = Fe,Co,Cu,Ni） were synthesized and characterized by IR, UV. In the infrared spectrum there are four characteristic absorptional peaks in the 700 - 1100 cm^-1. There are two absorptional peals at 200 nm and 290 nm in UV - vis spectrum. The experimental results indicate that they are all the Heteropoly acid with Dawson structure, N -butyl acetate was synthesized under the catalytic of the polyoxotungstates, the best reaction condition were determined. It is that the mole proportion of acid and alcohol is 1 ： 1, that the amount of catalyst is one percent in total, and that the reaction time is 5 h. The result of catalytic activity of heteropoly acid is Na18 P2W15Ni3O62 ] 〉 Na18 P2W15CO3062 ] 〉 Na18 P2W15Fe3O62 ] 〉 Na18 P2W15Cu3O62 ].