鉴于 2-羟基联芳基化合物在有机化学、药物化学和材料化学中的重要作用,合成这种常见基序的简明方法非常有价值。在寻求扩展合成化学家在这方面的词典时,我们开发了一种使用现成的硼酸对苯酚和萘酚进行邻位芳基化的权宜之计和通用策略。我们的方法依赖于通过伸缩的 B 到 Bi 转金属和氧化从工作台稳定的 Bi(III) 前体原位生成独特的反应性 Bi(V) 芳基化剂。通过利用与传统金属催化歧管正交的反应性,多种芳基和杂芳基伙伴可以在温和条件下与苯酚和萘酚快速偶联。芳基化后,Bi(III)前体的高产率回收允许其在后续反应中有效地重复使用。对该方法的每个关键步骤的机械询问为其实际应用提供了信息,并提供了对有机铋化合物未充分利用的反应性的基本见解。
[EN] LIQUID CRYSTAL COMPOUNDS, LIQUID CRYSTAL MEDIUM AND LIQUID CRYSTAL DISPLAY<br/>[FR] COMPOSES A CRISTAUX LIQUIDES, MILIEU A CRISTAUX LIQUIDES ET AFFICHEUR A CRISTAUX LIQUIDES
申请人:MERCK PATENT GMBH
公开号:WO2005095544A1
公开(公告)日:2005-10-13
The instant invention relates to mesogenic compounds with mesogenic group and one or more bulky end groups which each contain at least two ring elements, where two of these ring elements are linked to a centre atom or to a centre group by a direct bond or via a linking group, preferably of Formula (I) wherein the parameters are as specified in the text. This bulky end group preferably contains two or more rings, which each are bound to one and the same linking atom. The instant invention further relates to mesogenic media, preferably liquid crystal media showing a blue phase and their use in electro-optical light modulation elements and their respective use in displays, as well as to such devices.