合成聚芳酯树状分子的新方法

A New Method of Syntheses of Aromatic Polyester Dendrimer

以３，５－二羟基苯甲酸为起始原料，经甲醇酯化保护羧基，与苯甲酰氯反应，得到３，５－二苯甲酰氧基苯甲酸甲酯，用ＡｌＣｌ＿３／ＮａＩ去掉保护基甲基，以高收率得到３，５－二苯甲酰氧基苯甲酸，此酸与３，５－二羟基苯甲酸甲酯反应得到第二代酯端基树枝，再去掉保护基甲基，得到第二代羧酸树枝，将其与联苯二酚反应得到聚芳酯树状分子，其结构均由ＩＲ、１ＨＮＭＲ、ＥＡ等方法证实。

Dihydroxybenzoic acid,the starting material, is esterified with methanol to protect the carboxylic group,then react with benzoyl chloride to obtain methyl 3, 5-bisbenzoyloxybenzoate,3,5-Bisbenzoyloxybenzoic acid is obtained with high yield by removing the protecting group with AlCl3/NaI. Then this acid reacts with methyl 3, 5-dihydroxybenzoate to obtain the second generation dendron with methyl ester at the anchor point.The second genration acid is obtained by deprotecting with AlCl3/NaI.Aryl poly-ester dendrimer is obtained by the reaction of the acid with 4, 4' -biphenol.Their structures are established with IR and NMR spectra.