01339nas a2200241   4500008004100000022001400041245009600055210006900151260007700220300001400297490000700311520047300318653001300791653002200804653002600826653002000852653001300872100002200885700002200907700002300929700001900952856012600971       2011                        eng d  a1433-785100aN-Heterocyclic carbene catalyzed umpolung of michael acceptors for intermolecular reactions0 aNHeterocyclic carbene catalyzed umpolung of michael acceptors fo  aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcAUG  a8412-84150 v503 a<p>eahciM! The N-heterocyclic carbene catalyzed umpolung of Michael acceptors proceeds through the formation of a deoxy-Breslow intermediate (see scheme; EWG=electron-withdrawing group). This nucleophilic species can react with other Michael acceptors in an intermolecular fashion, thereby resulting in the formation of homo- or heterodimeric olefins. This “Michael umpolung” should become a valuable method for the formation of densely functionalized olefins.</p>10acarbenes10aMichael acceptors10anitrogen heterocycles10aorganocatalysis10aumpolung1 aBiju, Akkattu, T.1 aPadmanaban, Mohan1 aWurz, Nathalie, E.1 aGlorius, Frank  uhttps://library.ncl.res.in/content/n-heterocyclic-carbene-catalyzed-umpolung-michael-acceptors-intermolecular-reactions-0