Isomerization of Electron-Poor Alkynes to the Corresponding (E,E)-1,3-Dienes Using a Bifunctional Polymeric Catalyst Bearing Triphenylphosphine and Phenol Groups
作者:Patrick Toy、Cathy Kwong、Michael Fu、Henry Law
DOI:10.1055/s-0030-1258576
日期:2010.10
The use of a bifunctional non-cross-linked polystyrene bearing both phosphme and phenol groups tor the organocatalytic isomerization of alkynes bearing electron-withdrawing ester substituents to afford the corresponding (E,E)-dienes in excellent yield and stereoselectivity is described. When polystyrene functionalized with only phosphine groups was used as the catalyst, either low or no yield of the
demonstrated as olefinating agents in the silver-catalyzed olefination of aryl and cinnamyl aldehydes to make α,β- and α,β,γ,δ-unsaturated esters with excellent E-selectivity. Trimethyl orthoformate plays a dual role by generating nucleophilic allenolate from propiolate and more electrophilic oxocarbenium ion fromaldehyde to effect the reaction.
Liquid Crystal Photoalignment Agent, Liquid Crystal Photoalignment Film Using the Same, and Liquid Crystal Display Device Including the Liquid Crystal Photoalignment Film
申请人:YOO Yong-Sik
公开号:US20130165598A1
公开(公告)日:2013-06-27
Disclosed are a liquid crystal photoalignment agent, a liquid crystal photoalignment film using the same, and a liquid crystal display including the liquid crystal photoalignment film. The liquid crystal photoalignment agent includes a polymer including polyamic acid including a repeating unit represented by Chemical Formula 1, polyimide including a repeating unit represented by Chemical Formula 2, or a combination thereof, or includes a first polymer including polyamic acid including a repeating unit represented by Chemical Formula 5, polyimide including a repeating unit represented by Chemical Formula 6, or a combination thereof; and a second polymer including polyamic acid including a repeating unit represented by Chemical Formula 7, polyimide including a repeating unit represented by Chemical Formula 8, or a combination thereof, wherein Chemical Formulae 1, 2 and 5 to 8 are the same as defined in the detailed description.
Diastereo-, Enantio-, and <i>Z</i>-Selective α,δ-Difunctionalization of Electron-Deficient Dienes Initiated by Rh-Catalyzed Conjugate Addition
作者:Christopher J. C. Cooze、Wesley McNutt、Markus D. Schoetz、Bohdan Sosunovych、Svetlana Grigoryan、Rylan J. Lundgren
DOI:10.1021/jacs.1c05427
日期:2021.7.21
with organoboronic acid nucleophiles and aldehyde electrophiles to generate Z-homoallylic alcohols with three stereocenters. The reaction accommodates diene substrates activated by ester, amide, ketone, or aromatic groups and can be used to couple aryl, alkenyl, or alkyl aldehydes. Diastereoselective functionalization of the Z-olefin unit in the addition products allows for the generation of compounds
Organocatalytic Alkyne Isomerizations under Flow Conditions Using Heterogeneous Bifunctional Polystyrene Bearing Phosphine and Phenol Groups
作者:Andreas Kirschning、Patrick Toy、Sascha Ceylan、Henry Law
DOI:10.1055/s-0036-1588589
日期:——
polymer bearing phosphine and phenol groups was developed to catalyze the isomerization of electronically activated alkynes. This organocatalytic process provided the corresponding (E,E)-dienes and was shown to work under both batch and flow conditions. A heterogeneous bifunctional polymer bearing phosphine and phenol groups was developed to catalyze the isomerization of electronically activated alkynes