A synthetic strategy toward branched oligomesogenic phosphonic acids: comparison of alternative pathways
作者:Maksym F. Prodanov、Olga V. Vashchenko、Valerii V. Vashchenko
DOI:10.1016/j.tetlet.2013.11.022
日期:2014.1
This work is devoted to the elaboration of a practical scheme for the synthesis of dendritic derivatives of gallic acid containing a carboxylate-ω-alkylphosphonic acid group and three terminal promesogenic substituents. Two synthetic strategies toward the target compounds were examined that differ in the sequence of the introduction of the promesogenic units and ω-alkylphosphonic group.
Palladium-catalyzed Suzuki cross-coupling reactions in a microemulsion
作者:Valery Vashchenko、Alexander Krivoshey、Irina Knyazeva、Alexey Petrenko、John W. Goodby
DOI:10.1016/j.tetlet.2008.01.013
日期:2008.2
An enhancement of palladium-catalyzedSuzukicross-coupling reactions between substrates possessing long-chain alkyl or oxyalkyl substituents in two-phase media, in the presence of sodium dodecylsulfate, is shown. Quantitative evaluations of the influence of SDS on the reaction rates were determined.
Novel halogen-containing ester compounds, and their intermediates, and
申请人:Nippon Mining Co., Ltd.
公开号:US05098602A1
公开(公告)日:1992-03-24
This invention provides a novel halogen-containing ester compound represented by the following general formula (I): ##STR1## (wherein R is an alkyl group, A is selected from a single bond, --O--, --COO-- and --CO--, both of X and Y are halogen atoms or either one of X and Y is a halogen atom and the other is a hydrogen atom, each of m and n is 0 or 1, m+n=0 or 1, each of k and l is an integer of 1 or more, provide k<l), a liquid crystal composition and a light switching element each containing the above compound as well as a novel fluorophenol compound represented by the following general formula (II): ##STR2## (wherein each of k and l is an integer of 1 or more, provided k<l) as an intermediate for the synthesis of the above ester compound and a method of producing the same.
Novel halogen-containing ester compounds, and their intermediates, and method of producing the same as well as liquid crystal compositions containing the same and light switching elements
申请人:JAPAN ENERGY CORPORATION
公开号:EP0341686A2
公开(公告)日:1989-11-15
This invention provides a novel halogen-containing ester compound represented by the following general formula ( I ):
(wherein R is an alkyl group, A is selected from a single bond, -O-, -COO- and -CO-, both of X and Y are halogen atoms or either one of X and Y is a halogen atom and the other is a hydrogen atom, each of m and n is 0 or 1, m+n=0 or 1, each of k and ℓ is an integer of 1 or more, provide k<ℓ), a liquid crystal composition and a light switching element each containing the above compound as well as a novel fluorophenol compound represented by the following general formula ( II ):
(wherein each of k and ℓ is an integer of 1 or more, provided k<ℓ) as an intermediate for the synthesis of the above ester compound and a method of producing the same.
本发明提供了一种新型含卤素酯化合物,由以下通式( I )表示:
(其中 R 为烷基,A 选自单键、-O-、-COO- 和 -CO-,X 和 Y 均为卤素原子或 X 和 Y 中的一个为卤素原子而另一个为氢原子,m 和 n 中的每个均为 0 或 1,m+n=0 或 1、其中 k 和 ℓ 各为 1 或 1 以上的整数,提供 k<ℓ)、液晶组合物和光开关元件,每种组合物和光开关元件都含有上述化合物以及由下式通式 ( II ) 表示的新型氟苯酚化合物:
(其中 k 和 ℓ 均为 1 或 1 以上的整数,条件是 k<ℓ)作为合成上述酯类化合物的中间体以及生产上述酯类化合物的方法。
Optically active compound having a delta- valerolactone ring and liquid crystal composition containing same