2,5-双[4′-(正-烷氧基联苯基)-4-碳酰氧基]对苯二酚的合成  

Synthesis of 2,5-bis[4′-(n-alkoxylbiphenyl)-4-carboxyl]hydroquinone

作　　者：张淑媛[1] 朱鑫[1] 刘萃红 王鹏飞[1] 

机构地区：[1]郑州大学化学系,郑州450001 [2]郑州大学第一附属医院,郑州450052

出　　处：《郑州大学学报（理学版）》2006年第1期79-82,共4页Journal of Zhengzhou University:Natural Science Edition

基　　金：国家自然科学基金资助项目;编号29974026;河南省自然科学基金;河南省教育厅自然科学基金资助项目

摘　　要：以4′-正-烷氧基联苯基-4-甲酸和2,5-二羟基苯醌为原料,通过酯化和还原反应合成了一系列新的液晶性2,5-双[4′-(正-烷氧基联苯基)-4-碳酰氧基]对苯二醌(化合物1)和2,5-双[4-′(正-烷氧基联苯基)-4-碳酰氧基]对苯二酚(化合物2).化合物2的结构通过元素分析、红外光谱和核磁共振波谱等方法确证,其液晶行为用示差扫描量热法(DSC)和偏光显微镜(POM)表征.发现化合物2加热至各自的熔点以上都能形成液晶态,在液晶态可以观察到近晶相和向列相的典型织构.随分子中末端烷氧基碳原子数增加,化合物2的熔点(Tm)和液晶态的清亮点(Ti)呈规律性变化,近晶相范围和近晶相-向列相转变温度渐增,而向列相范围递减.A series of novel liquid crystalline 2,5-bis[4＇-（n-alkoxylbiphenyl）-4-carboxyl-]quinone （Compound 1） and 2,5-bis[-4＇ （n alkoxylbiphenyl）-4-carboxyl-] hydroquinone （Compound 2） are synthesized via esterization and reactions by using 4＇-（n-alkoxy- biphenyl）-4-carboxylic acid and 2,5-dihydroxyquinone as raw materials. The structures of Compound 2 are identified by using elemental analysis,infrared spectra and nuclear magnetion reasonance. The liquid crystalline behavior of Compound 2 is characterized by differential scanning calorimetry（DSC） and polarizing optical microscopy（POM）. It is found that Compound 2 goes into liquid crystal phase when heated to its respective melting point（Tm）. The typical smectic phase and nematic phase texture can be ob served. Both Tm and isotropization temperature（Ti ） of Compound 2 change regularly with the carbon numbers of the end alkoxy groups. There is a gradual increase in smectic phase length and so is the smectic-nematic transition temperature. At the same time there is a gradual decrease in nematic phase length.

关 键 词：2 5-双[4’(正-烷氧基联苯基)4碳酰氧基]对苯二酚 热致性液晶 合成 

分 类 号：O625.31[理学—有机化学]