Photoactive silane derivatives for liquid crystals
申请人:Rolic AG
公开号:US05965761A1
公开(公告)日:1999-10-12
The invention provides novel cross-linkable, photoactive silane derivatives and mixtures with 3-aryl-acrylic acid esters and amides. The present invention also provides orienting layers for liquid crystals, and non-structured and structured optical elements and multi-layer systems based on the silane mixtures and derivatives.
Catalytic Cleavage and Reformation of Ethereal σ-Bonds
作者:Masahito Murai、Kazuki Origuchi、Kazuhiko Takai
DOI:10.1246/cl.180361
日期:2018.7.5
Ether-exchange reaction of alkyl aryl ethers with alcohols and thiols via the cleavage of the C(sp2)–O bond is described. Bi(OTf)3 was found to be a most effective catalyst, and etherification of fused-aromatic ethers proceeded efficiently. Monitoring of reactions revealed conceptually new transetherification between two different ethers, which can be regarded as single-bond metathesis under the same
The invention provides compounds of formula I:
wherein
A1 to A4are independently selected from the group consisting hydrogen, a methyl group and a hydrocarbon group containing from 2 to 80 carbon atoms in which one or more carbon atoms are optionally replaced by a heteroatom selected from the group consisting -O-, -S- and -N- with the proviso that firstly no two heteroatoms are joined together and secondly that at least one of A1 to A4 includes a polymerisable group;
B1represents a hydrocarbon group containing from 4 to 80 carbon atoms, in which one or more carbon atoms are optionally replaced by a heteroatom selected from the group consisting -O-, -S- and -N- with the proviso that no two heteroatoms are joined together;
MG1 and MG2are the same or different and each independently represents an aromatic or non-aromatic carbocyclic or heterocyclic ring system containing from 1 to 80 carbon atoms, with the proviso that firstly at least one of MG1 and MG2 comprises at least two ring systems and secondly, when MG1 and MG2 are identical each of A1 and A2 or A3 and A4 are different.
The invention also provides liquid crystalline mixtures and optical or electro-optical devices including compounds of formula (I).
Compounds of formula I:
wherein the variables are defined as explained in the disclosure. The invention also provides liquid crystalline mixtures and optical or electro-optical devices including compounds of formula (I).