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Chloride abstraction from [(R,R)‐(iPrDuPhos)Co(μ‐Cl)]2 with NaBArF4 (BArF4=B[(3,5‐(CF3)2)C6H3]4) in the presence of dienes, such as 1,5‐cyclooctadiene (COD) or norbornadiene (NBD), yielded long sought‐after cationic bis(phosphine) cobalt complexes, [(R,R)‐(iPrDuPhos)Co(η2,η2‐diene)][BArF4]. The COD complex proved substitutionally labile undergoing diene substitution with tetrahydrofuran, NBD, or arenes...
Kationische Rhodiumphosphin‐Komplexe vom Schrock‐Osborn‐Typ sind in den 1970er Jahren entdeckt und seitdem intensiv erforscht worden. Sie bilden die Grundlage für die moderne homogene und asymmetrische Katalyse. Cobalt, das Homologe des Rhodiums in der ersten Reihe, ist ein attraktiver Ersatz für diese privilegierte Katalysatorklasse, jedoch sind die Cobaltanaloga seit über 40 Jahren schwer fassbar...
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