4-烷基苯甲酸液晶中间体的合成及其液晶性能  

The synthesis and properties of liquid crystal intermediates 4-alkyl benzoic acids

作　　者：郑敏燕[1] 杨杰 武永刚[1] 

机构地区：[1]咸阳师范学院化学与化工学院,陕西咸阳712000

出　　处：《应用化工》2012年第7期1158-1161,共4页Applied Chemical Industry

基　　金：国家自然科学基金资助(21102121);陕西省科技厅自然科学基金资助(2010JM2009);咸阳师范学院大学生科研训练项目(2011013)

摘　　要：以苯、C2～C5的酰氯为原料,经傅-克酰基化、黄鸣龙还原、乙酰化反应和溴仿反应合成了4个端基为C2～C5的单环芳香酸。以气相色谱-质谱联用仪、红外光谱仪、紫外光谱仪对芳香酸结构进行了表征。利用差热扫描量热仪、热台偏光显微镜对化合物的液晶性能进行了测试。结果表明,对于分子的长径比小于4的这类化合物,通过分子间氢键缔合的形式,亦可产生液晶相;其液晶相温度范围为9～20℃,呈现出向列相纹影织构。4 Single ring aromatic acids with terminal alkyls from C2 to C5 were synthesized with benzene and acyl chloride from C2 to C5 as raw materials by reactions of F-C, Huang Minglong, acylation,reduction of acetylation and bromoform. Their structures were characterized by gas chromatography-mass spectrome- try,infrared spectrophotometer and UV spectrophotometer. Their property of liquid crystal was also detec- ted by using differential scanning calorimeter and thermal platform polarized microscope. The results showed molecules whose ratios of length to width were less than 4 can also form mesophases by hydrogen boding between double molecules. The temperature ranges of mesophase of the series of liquid crystals were hetween 9 ~ and 20 ~ showing a nematic schlieren textures

关 键 词：4-烷基苯甲酸 乙酰化 溴仿反应 液晶 

分 类 号：TQ245.2[化学工程—有机化工]