Rapid synthesis of new discotic liquid crystals based on diquinoxalino[2,3-a:2′,3′-c]phenazine containing hexakis(alkoxy) side arms
作者:Chi Wi Ong、Su-Chih Liao、Tsu Hsing Chang、Hsiu-Fu Hsu
DOI:10.1016/s0040-4039(02)02862-9
日期:2003.2
5-diaminobenzene 2a–e derivatives with freshly prepared hexaketocyclohexane give hexakis(alkoxy)diquinoxalino[2,3-a:2′,3′-c]phenazines in good yield. DSC and polarization microscopy showed HATOC6 has both the crystalline (K) to mesophase (M) and the mesophase (M) to isotropic (I) phase transitions. Importantly, the alkoxy substituted compound synthesized showed an M–I transition because of greater stability, whereas
1,2-双烷氧基-4,5-二氨基苯2a - e衍生物与新鲜制备的六酮环己烷的缩合反应可得到高收率的六(烷氧基)二喹喔啉[2,3- a:2',3'- c ]吩嗪。DSC和极化显微镜显示HATOC6既具有晶体(K)到中间相(M)的转变,又具有中间相(M)到各向同性(I)的转变。重要的是,合成的烷氧基取代的化合物由于具有更高的稳定性而显示出M–I过渡,而据报道的烷基硫醇在中间相后会分解。