Optically active compound, liquid crystal composition containing the
申请人:Canon Kabushiki Kaisha
公开号:US05624600A1
公开(公告)日:1997-04-29
An optically active compound represented by a formula (I) characterized by containing an oxazolidinone-3,5-diyl skeleton directly connected to cyclic groups in 3 and 5 positions is suitable as a component for a liquid crystal composition providing improved response characteristics and a high contrast. A liquid crystal device is constituted by disposing the liquid crystal composition between a pair of electrode plates. The liquid crystal device may preferably be used as a display panel constituting a liquid crystal apparatus providing good display characteristics.
Optically active compound, liquid crystal composition containing the compound, liquid crystal device using the composition, liquid crystal apparatus and display method
申请人:CANON KABUSHIKI KAISHA
公开号:EP0683158A2
公开(公告)日:1995-11-22
An optically active compound characterized by containing an oxazolidinone-3,5-diyl skeleton directly connected to cyclic groups in 3 and 5 positions is suitable as a component for a liquid crystal composition providing improved response characteristics and a high contrast. A liquid crystal device is constituted by disposing the liquid crystal composition between a pair of electrode plates. The liquid crystal device may preferably be used as a display panel constituting a liquid crystal apparatus providing good display characteristics.
Comparison of Base‐Promoted and Self‐Catalyzed Conditions in the Synthesis of Isocyanates from Amines Using Triphosgene
作者:Yiannis C. Charalambides、Stephen C. Moratti
DOI:10.1080/00397910601055156
日期:2007.3.1
Comparison of base-promoted and self-catalyzed conditions for the synthesis of isocyanates from amines and triphosgene shows no advantage in using an amine base in the majority of cases. The workup and isolation of the product is simplified under base-free conditions. Yields of between 50 and 90% after distillation were common. Only acid-sensitive substrates need a base catalyst.
CIZMARIK, J.;BOROVANSKY, A.;TUMOVA, I., PHARMAZIE, 42,(1987) N 10, 702-703