Metal-Free Photocatalyzed Cross Coupling of Bromoheteroarenes with Pyrroles
作者:Leyre Marzo、Indrajit Ghosh、Francisco Esteban、Burkhard König
DOI:10.1021/acscatal.6b01452
日期:2016.10.7
successively trapped by pyrroles for the synthesis of heteroaromatic biaryls in moderate to excellent yields. The synthetically important photoredox catalytic C–H heteroarylation reaction works for a broad range of brominated electron-rich heteroarenes and chlorinated heteroarenes bearing electron withdrawing groups. In addition, this methodology was applied to the formal synthesis of a benzimidazole derivative
A liquid crystal composition which prevents production of an alignment defect of a liquid crystal compound and also has excellent storage stability during dissolution in a solvent is provided. The liquid crystal composition is suitable for constituting a retardation film capable of favorable circular polarization conversion. The liquid crystal composition includes a polymerizable liquid crystal compound having 3 or more ring structures in the main chain, and aluminum. A content of the aluminum is 1 ppm or more and 170 ppm or less relative to the polymerizable liquid crystal compound.
A liquid crystal composition containing a polymerizable liquid crystal compound (A) having 5 or more ring structures in its main chain and a polymer (B) of the polymerizable liquid crystal compound (A) having 5 or more ring structures in its main chain, which inhibits occurrence of an orientation defect of a liquid crystal compound and exhibits excellent storage stability when dissolved in a solvent is provided.
Liquid crystal composition, method of producing the same, and retardation film constituted from the same
申请人:Sumitomo Chemical Company, Limited
公开号:US11193065B2
公开(公告)日:2021-12-07
A liquid crystal composition is provided containing a polymerizable liquid crystal compound, the composition having high preservation stability when dissolved in a solvent and also having the ability to restrain the development of orientation defects of the liquid crystal compound. A method of producing such a liquid crystal composition is also provided with ease. The liquid crystal composition includes a first polymerizable liquid crystal compound having five or more ring structures on its principal chain and represented by the following formula (A) and a second polymerizable liquid crystal compound having five or more ring structures and represented by the following formula (B).