2,2′-Biphenols via Protecting Group-Free Thermal or Microwave-Accelerated Suzuki–Miyaura Coupling in Water
摘要:
User-friendly protocols for the protecting group-free synthesis of 2,2'-biphenols via Suzuki-Miyaura coupling of o-halophenols and o-boronophenol are presented. The reactions proceed in water in the presence of simple additives such as K2CO3, KOH, KF, or TBAF and with commercially available Pd/C as precatalyst. Expensive or laboriously synthesized ligands or other additives are not required. In the case of bromophenols, efficient rate acceleration and short reaction times were accomplished by microwave irradiation.
Disclosed are compounds of formula I
the use of compounds of formula I in liquid crystal media and in particular to flexoelectric liquid crystal devices containing the liquid crystal media.
公开的是公式I的化合物在液晶介质中的使用,特别是包含该液晶介质的柔性电液晶器件。
Homogeneous electrorheological fluid
申请人:Asahi Kasei Kogyo Kabushiki Kaisha
公开号:EP0657526A2
公开(公告)日:1995-06-14
[Purpose] To provide a homogenous electrorheological fluid free from the problem of particles sedimentation.
[Structure] An electrorheological fluid comprising, as a main component, a liquid crystal compound comprising a flexible molecular chain having at least two liquid crystal substances bonded thereto.
[Effect] Being free from the problem of sedimentation of particles and therefore, it can be applied with stability for prolonged period of time to novel compact actuators handled with electric control such as valve, clutch, brake and torque convertor.
Disclosed are compounds of formula I
the use of compounds of formula I in liquid crystal media and in particular to flexoelectric liquid crystal devices containing the liquid crystal media.
公开了式 I 的化合物
式 I 化合物在液晶介质中的应用,特别是在含有该液晶介质的柔电液晶装置中的应用。
Bimesogenic compounds and mesogenic media
申请人:Merck Patent GmbH
公开号:US10711196B2
公开(公告)日:2020-07-14
Bimesogenic compounds of formula I
and their use in liquid crystal media and in flexoelectric liquid crystal devices.
式 I 的生双酰胺化合物
及其在液晶介质和柔电液晶器件中的应用。
Methods of making telechelic oligomers, methods of making block copolymers, and novel block copolymers
申请人:——
公开号:US20020115793A1
公开(公告)日:2002-08-22
A method of making telechelic oligomers comprises reacting a substrate compound selected from the group consisting of relatively high molecular weight polymers with a chain transfer agent in the presence of an alkali metal catalyst. The telechelic oligomers thus produced may then be reacted with monomers according to known polymerization techniques in order to produce block copolymers.