Cover Picture: Diastereoselective Radical‐Type Cyclopropanation of Electron‐Deficient Alkenes Mediated by the Highly Active Cobalt(II) Tetramethyltetraaza[14]annulene Catalyst (ChemCatChem 8/2017). Issue 8 (21st April 2017)

• Record Type: Journal Article
• Authors: Chirila, Andrei; Gopal Das, Braja; Paul, Nanda D.; de Bruin, Bas
• Is Part Of: ChemCatChem. Volume 9:Issue 8(2017)
• Page Start: 1356
• Page End: 1356
• Publication Date: 2017-04-21
• Subjects: alkenes -- cobalt -- macrocyclic ligands -- phase-transfer catalysis -- reaction mechanisms; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.201700552
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract : The Front Cover shows [Co(MeTAA)], a fast metalloradical catalyst, rapidly approaching Earth's atmosphere like a comet. [Co(MeTAA)] means" comet" in Romanian (" Cometa"). Since Romania is the home country of the first author of this paper, and since [Co(MeTAA)] is faster than most other cobalt catalysts for olefin cyclopropanation reactions, a comet is the appropriate way to highlight this catalyst.In their Full Paper, A. Chirila, B. Gopal Das et al. describe the activity of [Co(MeTAA)], a cheap and easy to prepare metalloradical catalyst, in olefin cyclopropanation reactions using both diazo compounds and tosyl hydrazones as carbene precursors. Interestingly, the [Co(MeTAA)] catalyst is active enough to mediate carbene transfer from tosyl hydrazones even at room temperature. This intriguing fact triggers new investigations, and holds the promise to develop a series of new metalloradical ring‐closing reactions. More information can be found in the Full Paper by A. Chirila, B. Gopal Das et al. onpage 1413 in Issue 8, 2017 (DOI:10.1002/cctc.201601568 ).