Topic
Cobalt
About: Cobalt is a research topic. Over the lifetime, 69899 publications have been published within this topic receiving 1242058 citations. The topic is also known as: Co & Element 27.
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TL;DR: In this article, a new synthetic technique leads to sharp distributions of active sites near outer pellet surfaces by controlling the rate of imbibition of cobalt nitrate melts, leading to higher synthesis rates and C5+ selectivity.
197 citations
TL;DR: In this article, acceptorless, reversible dehydrogenation and hydrogenation reactions involving N-heterocycles are reported with a well-defined cobalt complex supported by an aminobis(phosphine) [PN(H)P] pincer ligand.
Abstract: Acceptorless, reversible dehydrogenation and hydrogenation reactions involving N-heterocycles are reported with a well-defined cobalt complex supported by an aminobis(phosphine) [PN(H)P] pincer ligand. Several N-heterocycle substrates have been evaluated under dehydrogenation and hydrogenation conditions. The cobalt-catalyzed amine dehydrogenation step, a key step in the dehydrogenation process, has been independently verified. Control studies with related cycloalkanes suggest that a direct acceptorless alkane dehydrogenation pathway is unlikely. The metal–ligand cooperativity is probed with the related [PN(Me)P] derivative of the cobalt catalyst. These results suggest a bifunctional dehydrogenation pathway and a nonbifunctional hydrogenation mechanism.
197 citations
TL;DR: In this paper, the authors show that in the presence of CO, CO2 hydrogenation is slow and the catalyst deactivates more rapidly for the conversion of CO than for CO2 even though the H2O/H2 ratio is at least two times larger for the converted CO2.
197 citations
TL;DR: An extremely efficient cobalt catalyst for the hydroboration of both vinylarenes and aliphatic α-olefins with pinacolborane is described, providing the anti-Markovnikov products with excellent regio- and chemoselectivity, broad functional-group tolerance, and high turnover numbers.
Abstract: An extremely efficient cobalt catalyst for the hydroboration of both vinylarenes and aliphatic α-olefins with pinacolborane is described, providing the anti-Markovnikov products with excellent regio- and chemoselectivity, broad functional-group tolerance, and high turnover numbers (up to 19,800). The alkene hydroboration route is further extended to a two-step, one-pot hydroboration and cross-coupling of alkylboronates with aryl chlorides.
197 citations
TL;DR: Synthese et caracterisation de complexes cage derives de produits de reaction entre Co(sen) 3 3+ et Co (sen=(amino-4 aza-2 butyl)-5 methyl-5 diaza-3,7 nonane-diamine-1,9), avec formaldehyde et nitromethane en solution basique as mentioned in this paper.
Abstract: Synthese et caracterisation de complexes cage derives de produits de reaction entre Co(sen) 3 3+ et Co(sen) 3+ (sen=(amino-4 aza-2 butyl)-5 methyl-5 diaza-3,7 nonane-diamine-1,9), avec formaldehyde et nitromethane en solution basique. Structure cristalline de [Co(diNO sar-H)]Cl 2 •4H 2 O
197 citations