2,5-Diformylbenzene-1,4-diol (5) is a well-suited starting compound for the preparation of ditopic hydroquinone-based ligands. Here, we report an optimized synthesis of 5 which improves the overall yield from published 7% to 42 %. Three new ditopic Schiff base ligands, 2,5-[iPr2N(CH2)2N=CH]2 - 1,4-(OH)2-C6H2 (8), 2,5-(pyCH2N=CH)2-1,4-(OH)2-C6H2 (9), and 2,5-[py(CH2)2N=CH]2-1,4- (OH)2-C6H2 (10), have been synthesized from 5 and structurally characterized by X-ray crystal structure analysis (py = 2-pyridyl).
2,5-二甲酰基苯-1,4-二酚(5)是制备二受体羟基喹啉基配体的起始化合物。在这里,我们报告了一种优化的5的合成方法,将其总产率从已发表的7%提高到42%。从5合成了三种新的二受体席夫碱配体,分别为2,5-[iPr2N(CH2)2N=CH]2 - 1,4-(OH)2-C6H2(8)、2,5-(pyCH2N=CH)2-1,4-(OH)2-C6H2(9)和2,5-[py(CH2)2N=CH]2-1,4- (OH)2-C6H2(10),并通过X射线晶体结构分析进行了结构表征(py = 2-吡啶基)。