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Cover Picture: Diastereoselective Radical‐Type Cyclopropanation of Electron‐Deficient Alkenes Mediated by the Highly Active Cobalt(II) Tetramethyltetraaza[14]annulene Catalyst (ChemCatChem 8/2017)
Author(s) -
Chirila Andrei,
Gopal Das Braja,
Paul Nanda D.,
de Bruin Bas
Publication year - 2017
Publication title -
chemcatchem
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201700552
Subject(s) - cyclopropanation , catalysis , cobalt , diazo , chemistry , carbene , olefin fiber , medicinal chemistry , photochemistry , organic chemistry
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. on page 1413 in Issue 8, 2017 (DOI: 10.1002/cctc.201601568).