Synthesis and investigation of fullerene-based acceptor materials
摘要:
We synthesised a range of new fullerene compounds that showed significantly different photoluminescence quenching abilities in the blends with a polyconjugated polymer; the observed influence of the size and shape of the groups attached to the fullerene cage on the photoinduced charge separation can potentially be used for improvement of power conversion efficiencies in plastic solar cells.
Highlyenantioselectivehydrosilylation of γ-iminoesters with trichlorosilane promoted by a chiral Lewisbase proceeded smoothly to provide various optically active γ-amino esters in good yields (up to 96 %) with excellent enantioselectivities (up to 99 % ee) at –10 °C in Cl2CHCHCl2. The side reactions were successfully reduced by rational modification of the substrate. The absolute configuration
Verfahren zur stereoselektiven Reduktion von 4-Aryl-4-oxobutansäure-derivaten
申请人:BAYER AG
公开号:EP1369410A1
公开(公告)日:2003-12-10
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung stereoisomerenangereicherter 4-Aryl-4-hydroxybutansäurederivate durch Reduktion von 4-Aryl-4-ketobutansäurederivaten in Gegenwart von Ruthenium enthaltenden Katalysatoren, von mindestens einem Amin, und von Ameisensäure, Formiaten oder Mischungen davon.
An unprecedented tandem trifluoromethylsilylation/intramolecular SN2 substitution sequence was realized by using bifunctional reagent Me2(CH2Cl)SiCF3, allowing efficient construction of valuable trifluoromethylated oxasilacyclohexanes that are difficult to access by known methods. Initial attempts into developing asymmetric variant reveal that using cinchonine-derived dimeric PTC catalyst could afford
通过使用双功能试剂 Me 2 (CH 2 Cl)SiCF 3实现了前所未有的串联三氟甲基硅烷化/分子内 S N 2 取代序列,从而可以高效构建已知方法难以获得的有价值的三氟甲基化硅氧烷环己烷。开发不对称变体的初步尝试表明,使用辛可宁衍生的二聚 PTC 催化剂可以提供高达 92% 对映体过量的手性硅氧烷环己烷。