Metal-Free Generation of γ-Cyanoalkyl Radicals by N-Heterocyclic Carbene Catalysis: Assembly of 6-Cyanoalkyl Phenanthridines
作者:Qianrong Li、Cong-Ying Zhou、Chengming Wang
DOI:10.1021/acs.orglett.2c03808
日期:2022.12.23
number of γ-cyanoalkyl radicals were generated by sustainable N-heterocyclic carbene catalysis in tin-, transition-meal-, and light-free conditions, followed by insertion into biaryl isonitriles, thus leading to the rapid assembly of a variety of diversely functionalized 6-cyanoalkyl phenanthridines. A preliminary mechanism study revealed that a single-electron transfer radical process was possibly involved
Pleochroic dyes suitable for use in solution with liquid crystal materials for electro-optic device applications
申请人:BDH Chemicals Limited
公开号:EP0002104A1
公开(公告)日:1979-05-30
A liquid crystal material includes in solution therewith a pleochroic dye characterised in that the dye is an anthraquinone of general formula:
where R2 is either hydrogen or a hydroxyl group and where R3 is an anilino or substituted or modified anilino group and where R, is hydrogen when R2 is a hydroxyl group and R, is an anilino or substituted or modified anilino group, preferably the same as R3, when R2 is hydrogen. A large number of alternatives for R3 are disclosed.
Organic compositions suitable for guest-host liquid crystal device
申请人:Secretary of State for Defence
in Her Britannic Majesty's Gov.
of the United Kingdom of
Great Britain and Northern Ireland
公开号:EP0049036A1
公开(公告)日:1982-04-07
A material suitable for a guest-host liquid crystal device comprises a solution of a liquid crystal material and a pleochroic dye wherein the pleochroic dye comprises at least one compound having a formula:
wherein one of X and Y is OH and the other is NHR wherein R is H or lower alkyl; each of R1 and R2 independently represents alkyl, aryl, aralkyl, alkoxy or -NR3R4 wherein each of R3 and R4 is independently H or lower alkyl, provided that R2 is always adjacent to an OH group.
一种适用于客主液晶装置的材料包括液晶材料和褶染染料的溶液,其中褶染染料包括至少一种具有以下式子的化合物: 其中 X 和 Y 中的一个是 OH,另一个是 NHR,其中 R 是 H 或低级烷基;R1 和 R2 中的每一个独立地代表烷基、芳基、芳烷基、烷氧基或-NR3R4,其中 R3 和 R4 中的每一个独立地代表 H 或低级烷基,条件是 R2 始终与 OH 基团相邻。
申请人:Secretary of State for Defence
in Her Britannic Majesty's Gov.
of the United Kingdom of
Great Britain and Northern Ireland
公开号:EP0059095A1
公开(公告)日:1982-09-01
A material suitable for a guest-host liquid crystal device comprises a solution of a liquid crystal material and a pleochroic dye where in the pleochroic dye comprises at least one anthraquinone compound free from water solubilising and ionic substituents and having the formula:
wherein Q is NH2, OH, alkyl, aryl, N02 or halo; n is 0 to 4;
each X independently is H, -SR, -NZ1Z2 or Q;
each R independently is alkyl, aryl or cycloalkyl;
Z1 & Z2 are independently H, alkyl, cycloalkyl or aryl; provided that there are at least two groups X which are different -SR groups.
一种适用于客主液晶装置的材料包括液晶材料和褶染染料的溶液,其中褶染染料包括至少一种不含水溶性和离子取代基的蒽醌化合物,其式为: 其中 Q 是 NH2、OH、烷基、芳基、N02 或卤代;n 是 0 至 4;每个 X 独立地是 H、-SR、-NZ1Z2 或 Q;每个 R 独立地是烷基、芳基或环烷基;Z1 和 Z2 独立地是 H、烷基、环烷基或芳基;条件是至少有两个基团 X 是不同的-SR 基团。
Dielectric materials
申请人:Secretary of State for Defence
in Her Britannic Majesty's Gov.
of the United Kingdom of
Great Britain and Northern Ireland
公开号:EP0091226A2
公开(公告)日:1983-10-12
A material suitable for a guest-host liquid crystal device comprises a solution of a liquid crystal material and a pleochroic dye characterised in that the dye comprises at least one anthraquinone compound free from water-solubilising and ionic substituents and having the formula:
wherein each of R and R' independently represents an n-alkyl group having from 4 to 7 carbon atoms inclusive and wherein each of R2 and R3 is independently selected from hydrogen and alkyl groups having from 1 to 4 carbon atoms inclusive.