The present invention relates to materials used for aligning liquid crystals of liquid crystal display elements and to a polymer for use in liquid crystal vertical alignment layer used in producing a liquid crystal vertical alignment layer.
The polymer for use in a liquid crystal vertical alignment layer includes (a) a moiety that is photochemically isomerizable but not photochemically crosslinked, (b) a moiety that is photochemically crosslinkable, and (c) a moiety that stabilizes a vertical alignment. The polymer can be used to produce a vertical alignment layer that has a liquid crystal alignment property enabling control of alignment at a low UV dose and that offers a large pretilt angle and superior optical stability.
Pd-Catalyzed Dearboxylative Heck Coupling with Dioxygen as the Terminal Oxidant
作者:Zhengjiang Fu、Shijun Huang、Weiping Su、Maochun Hong
DOI:10.1021/ol102158n
日期:2010.11.5
Pd-catalyzed decarboxylative Heck coupling of aromatic carboxylic acids with various olefins is developed using O-2 as the terminal oxidant. Enhancement of O-2 pressure leads to improving reaction turnover in this transformation and allows significantly reducing catalyst loading for efficient conversion of electron-rich benzoic acids. A Pd catalyst supported by a carbene ligand enables using electron-deficient benzoic acids as coupling partners.
US8633182B2
申请人:——
公开号:US8633182B2
公开(公告)日:2014-01-21
US9340634B2
申请人:——
公开号:US9340634B2
公开(公告)日:2016-05-17
Pd-catalyzed decarboxylative arylation of silyl enol ester sp3β-C–H bond under aerobic conditions
作者:Zhengjiang Fu、Shijun Huang、Jian Kan、Weiping Su、Maochun Hong
DOI:10.1039/c0dt01234c
日期:——
Pd-catalyzed aerobic oxidative coupling of various benzoic acids with silyl enolesters proceeds via a combination of decarboxylation with sp3 β-C–H bond activation to give Heck-type products. Mechanistic studies reveal this coupling involves in situ generation of olefin from aerobic oxidation of silyl enolate, followed by decarboxylative Heck coupling.