Ligand-controlled iridium-catalyzed semihydrogenation of alkynes with ethanol: highly stereoselective synthesis of <i>E</i>- and <i>Z</i>-alkenes
作者:Jinfei Yang、Chengniu Wang、Yufeng Sun、Xuyan Man、Jinxia Li、Fei Sun
DOI:10.1039/c8cc09714c
日期:——
iridium-catalyzed semihydrogenation of alkynes to E- and Z-alkenes with ethanol was developed. Effective selectivity control was achieved by ligand regulation. The use of 1,2-bis(diphenylphosphino)ethane (DPPE) and 1,5-cyclooctadiene (COD) was critical for the stereoselective semihydrogenation of alkynes. The general applicability of this procedure was highlighted by the synthesis of more than 40 alkenes, with
The present invention is concerned with novel sulfuric acid esters of sugar alcohols and sugar alcohol-like compounds of the formula ##STR1## Also described are methods for the treatment and/or prophylaxis of arteriosclerotic changes in the vascular wall as well as a process for the manufacture of the compounds of formula I and their salts.
Palladium-Catalysed Desulfitative Heck Reaction Tolerant to Aryl Carbon–Halogen Bonds for Access to (Poly)halo-Substituted Stilbene or Cinnamate Derivatives
(poly)halo-substituted benzenesulfonylchlorides with alkenes was investigated. Styrene or acrylates in the presence of bromo- or iodobenzenesulfonyl chlorides and a phosphine-free palladium catalyst were found to afford the expected β-arylated Heck type products with complete regio- and stereoselectivities. The reaction tolerates a variety of substituents on the halobenzenesulfonyl chloride. Moreover, no cleavage
Pincer Complex-Catalyzed Redox Coupling of Alkenes with Iodonium Salts via Presumed Palladium(IV) Intermediates
作者:Juhanes Aydin、Johanna M. Larsson、Nicklas Selander、Kálmán J. Szabó
DOI:10.1021/ol9010739
日期:2009.7.2
Palladium pincer complexes directly catalyze the redox coupling reactions of functionalized alkenes and iodonium salts. The catalytic process, which is suitable for mild catalytic functionalization of allylic acetates and electron-rich alkenes, probably occurs through Pd(IV) intermediates. Due to the strong metal−ligand interactions, the oxidation of phosphine and amine ligands of the pincer complexes
Stilbene derivative, light emitting element material, light emitting element, light emitting device and electronic appliance
申请人:Egawa Masakazu
公开号:US20070100180A1
公开(公告)日:2007-05-03
An object of the present invention to provide a novel stilbene derivative having a large energy gap. In addition, it is another object of the present invention to provide a novel light emitting element material having a large energy gap which is suitable for a host material in a light emitting layer. Further in addition, it is another object of the present invention to provide a novel light emitting element material having a large energy gap and an electron transporting property. The present invention provides a stilbene derivative represented by a following general formula (3) and a light emitting element material including the stilbene derivative represented thereby:
wherein, n is an integer of 0 or more and 2 or less and m is an integer of 1 or more and 2 or less.