and cyclohexane) and the relative rate of O—H insertion into methanol to stereospecific cyclopropanation of the olefin to C—H insertion into cyclohexane are calculated from the ratios of products and substrates. It is found (i) that the reactivities of the substrates decrease in the order of methanol, olefin and cyclohexane and (ii) that electron-donating substituents generally lead to reaction with
Iron‐Catalyzed Radical Asymmetric Aminoazidation and Diazidation of Styrenes
作者:Daqi Lv、Qiao Sun、Huan Zhou、Liang Ge、Yanjie Qu、Taian Li、Xiaoxu Ma、Yajun Li、Hongli Bao
DOI:10.1002/anie.202017175
日期:2021.5.25
Asymmetric aminoazidation and diazidation of alkenes are straightforward strategies to build value‐added chiral nitrogen‐containing compounds from feedstock chemicals. They provide direct access to chiral organoazides and complement enantioselective diamination. Despite the advances in non‐asymmetric reactions, asymmetric aminoazidation or diazidation based on acyclic systems has not been previously
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.
Configurational Isomers of a Stilbene-Linked Bis(porphyrin) Tweezer: Synthesis and Fullerene-Binding Studies
作者:Maher Fathalla、Janarthanan Jayawickramarajah
DOI:10.1002/ejoc.200901002
日期:2009.12
A new stilbene-tethered bis(porphyrin) tweezer 5 has been synthesized through a Sonogashira cross-coupling reaction. The tweezer exists as two configurational isomers [(Z) + (E)], which have distinct cavity sizes. Fullerene-binding studies show that the (Z) isomer of the tweezer has a significantly higher affinity toward both C60 and C70 compared to the (E) congener. In addition, the (Z) (E) photoisomerization