Knoevenagel反应合成聚苯撑乙烯类低聚体研究

摘要

以二元芳醛和5-氯/7-氯喹哪啶为原料,醋酐作为溶剂,在回流温度下通过Knoevenagel缩合反应合成了一系列聚苯撑乙烯类电致发光材料.通过改变投料比、溶剂用量和反应时间等对反应条件进行了优化.结果表明,反应最佳条件是投料比:n(间苯二甲醛):n(7-氯喹哪啶):n(醋酐)=1∶2.2∶15.9,反应时间为40h,收率达到79.3％.产物的结构用红外光谱,核磁共振,元素分析进行了表征.%A series of poly(phenylenevinylene) oligomers have been synthesized by Knoevenagel condensation reaction of 5-chloro/7-chloroquinaldine and aromatic dialdehydes with the medium of acetic anhydride at reflux temperature. The reaction conditions were optimized by changing feed ratio, usage of solvent, reaction time and so on. The optimal conditions were found as follows: reflux reaction of isophthalaldehyde, 7-chloroquinaldine and acetic anhydride at molar ratio of 1 : 2. 2 : 15. 9 for 40 h could give yield of 79. 3%. Structure of the products was confirmed by IR, 1H NMR and elemental a-nalysis.