Liquid crystalline bis(N-salicylideneaniline)s: synthesis and thermal behavior of constitutional isomers
作者:Uma S. Hiremath
DOI:10.1016/j.tetlet.2013.04.071
日期:2013.6
The first examples of mesogenic bis(N-salicylideneaniline)s (BSANs), wherein two lipophilic (half-disk shaped) entities are interlinked through the dihydroxydiformylbenzene core, were synthesized and characterized. In particular, three constitutional (positional) isomeric BSANs were prepared by the facile twofold condensation of 3,4,5-tris(alkoxy)anilines with 2,3-dihydroxyterephthalaldehyde, 4,6-
合成并表征了介晶双(N-水杨基苯胺)(BSAN)的第一个实例,其中两个亲脂性(半圆盘状)实体通过二羟基二甲酰基苯核相互连接。特别地,通过3,4,5-三(烷氧基)苯胺与2,3-二羟基对苯二甲醛,4,6-二羟基间苯二甲醛和2,5-二羟基对苯二甲醛的简便双缩合制备了三种结构(位置)异构BSAN。通过元素分析,FT-IR,1 H NMR和13建立了结构1 H NMR。质子NMR实验表明,它们仅以烯醇-亚胺(OH)形式存在。偏光光学显微镜,差示扫描量热法和粉末X射线衍射研究证明,在两组异构体中均出现了柱状的同构。