Efficient synthesis of symmetrical phthalate and maleate diesters using phosphinite ionic liquids
作者:H. Valizadeh、E. Khalili
DOI:10.1007/s13738-011-0065-0
日期:2012.8
Symmetrical dialkyl phthalates and maleates were synthesized using phosphinite ionic liquid as a catalyst and reaction medium. The results indicated that phosphinite ionic liquid shows better catalytic and reusable performance without using any acid or base catalyst. Under the optimum conditions, using 1-methyl-3-(4-phosphinitebutyl) imidazolium chloride as catalyst, the conversion of phthalic and maleic anhydrides to the corresponding diesters of primary and secondary alcohols was occurred in 72–85% yields. The diesters of tertiary alcohols and phenols could not be prepared by this method. A kind of widely used plasticizer, dioctyl phthalate, was prepared in good yield under these conditions. The ionic liquid could be reused three times after easy separation from the products without any disposal.
使用磷酸盐离子液体作为催化剂和反应介质合成了对称的二烷基邻苯二甲酸酯和马来酸酯。研究结果表明,磷酸盐离子液体在没有使用任何酸或碱催化剂的情况下,表现出更好的催化和重复使用性能。在最佳条件下,使用1-甲基-3-(4-磷酸盐丁基)咪唑氯化物作为催化剂,邻苯二甲酸酐和马来酸酐转化为相应的初级和次级醇的二酯,产率在72%到85%之间。这种方法无法制备三级醇和酚的二酯。在这些条件下,一种广泛使用的增塑剂,二辛基邻苯二甲酸酯,获得了良好的产率。离子液体经过简单的产品分离后可以重复使用三次,无需任何处置。