Chemoselective desulfurization-fluorination/bromination of carbonofluoridothioates for the O-trifluoromethylation and O-bromodifluoromethylation of alcohols
作者:Jie Liu、Haonan Xiang、Lvqi Jiang、Wenbin Yi
DOI:10.1007/s11426-021-1028-6
日期:2021.8
trifluoromethyl and alkyl bromodifluoromethyl ethers using carbonofluoridothioates (R-OC(=S)F) as precursors has been described. Carbonofluoridothioates were obtained upon the reaction of an alcohol and S=CF2 generated via the decomposition of an SCF3 anion, and then selectively transformed into their corresponding trifluoromethyl and bromodifluoromethyl ethers upon changing the reaction conditions. This
Diaminobenzene derivatives and polyimides prepared therefrom
申请人:Nissan Chemical Industries, Ltd.
公开号:US05665856A1
公开(公告)日:1997-09-09
A diaminobenzene derivative of the formula (I): ##STR1## wherein each of P and Q which may be the same or different from each other, is a single bond, or a bivalent organic group selected from the group consisting of --O--, --COO-- and --CONH--, R.sub.1 is a C.sub.2-22 straight chain alkylene group, and R.sub.2 is a cyclic group selected from the group consisting of an aromatic ring, an aliphatic ring, a heterocyclic ring and substituted forms of such rings.
Polymer composition, capable of forming a chiral nematic mesophase
申请人:STAMICARBON B.V.
公开号:EP0357850A1
公开(公告)日:1990-03-14
The invention relates to novel polymer compositions based on thermotropic chiral polymers, capable of forming a chiral nematic mesophase, characterized by the fact that the compositions consist of monomers which have the chiral centre in the spacer part of the molecule, between the main chain and the mesogenic unit in the side chain. The compositions are conceivably useful as selective light reflectors, information storage device materials and coloured coatings. Furthermore they may be used in non-linear optics.
Liquid crystal monomer compound and polymer obtained therefrom
申请人:Nippon Paint Co. Ltd.
公开号:EP0617110A1
公开(公告)日:1994-09-28
Disclosed is a liquid crystal monomer compound represented by formula (1):
wherein n is an integer of from 2 to 18, X is direct bond, -(C =O)-O-, -(C=O)-NH- or -N=N-, R¹ is hydrogen or a lower alkyl group, and R² is hydrogen, a cyano group or a methoxy group, as well as a liquid crystal polymer derived therefrom.