3,6-Disubstituted Cyclohexenones in the Synthesis of New Three Ring Liquid Crystalline Compounds with the Negative Dielectric Anisotropy
作者:G. Sasnouski、V. Bezborodov、R. Dabrowski、J. Dziaduszek
DOI:10.1080/15421406.2011.569518
日期:2011.6.30
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
提出了制备具有 2,3-二氟苯部分的三环液晶化合物的新改进方法。关键阶段是在碱的存在下,通过相应的曼尼希盐与 2-取代的乙酰乙酸酯(或甲基苄基酮)缩合来合成 3,6-二取代的环己-2-烯-1-酮。这些环己烯酮用五氯化磷氯化或用甲基碘化镁甲基化,然后氧化芳构化得到新的三环化合物,可用于具有负介电各向异性的液晶组合物。