3,6-Disubstituted Cyclohexenones in the Synthesis of New Three Ring Liquid Crystalline Compounds with the Negative Dielectric Anisotropy

被引：7
|
作者：
Sasnouski, G. [1 ]
Bezborodov, V. [1 ]
Dabrowski, R. [2 ]
Dziaduszek, J. [2 ]
机构：
[1] Inst Appl Phys Problems, Minsk 220108, BELARUS
[2] Mil Univ Technol, Warsaw, Poland
来源：
MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 2011年 / 542卷
关键词：
2; 3-Difluorobenzene derivatives; 3; 6-disubstituted cyclohex-2-en-1-ones; liquid crystal; synthesis;
D O I：
10.1080/15421406.2011.569518
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
New improved approach for preparation of the three ring liquid crystalline compounds with 2,3-difluorobenzene moiety is proposed. The key stage is the synthesis of 3,6-disubstituted cyclohex-2-en-1-ones via the condensation of the corresponding Mannich salts with 2-substituted acetoacetic esters (or methyl benzyl ketones) in the presence of base. The chlorination with phosphrous pentachloride of these cyclohexenones or methylation with methylmagnesium iodide followed oxidative aromatization give new three ring compounds, which could be used in the LC compositions with negative dielectric anisotropy.
引用
收藏
页码：56 / 61
页数：6
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