Cover Picture: Catalytic Asymmetric Hydroalkenylation of Vinylarenes: Electronic Effects of Substrates and Chiral N‐Heterocyclic Carbene Ligands (Angew. Chem. Int. Ed. 15/2015). Issue 15 (24th March 2015)

• Record Type: Journal Article
• Authors: Ho, Chun‐Yu; Chan, Chun‐Wa; He, Lisi
• Is Part Of: Angewandte Chemie international edition. Volume 54:Issue 15(2015)
• Page Start: 4403
• Page End: 4403
• Publication Date: 2015-03-24
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201502318
• Languages: English
• ISSNs: 1433-7851

Abstract

<abstract abstract-type="graphical" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p> <italic> <bold>An asymmetric cross‐hydroalkenylation …︁</bold> </italic> …︁ catalyzed by [NiH] complexes provides branched <italic>gem</italic>‐disubstituted olefins with high enantio‐ and chemoselectivity, depending on the steric and electronic effects of the substrates and N‐heterocyclic carbene (NHC) ligands. In their Communication on <ext-link ext-link-type="doi" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink">page 4512 ff., </ext-link> C.‐Y. Ho and co‐workers rule out a π–π stacking mechanism and suggest that the N‐aryl rings of the NHCs possibly "move like wings" to coordinate a π system with a Ni^II center.<boxed-text content-type="graphic" position="anchor" orientation="portrait"><graphic position="anchor" mimetype="image" xlink:href="ark:/27927/pgjdvhrs0d" orientation="portrait" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></boxed-text></p> </abstract>