ChemInform Abstract: Co2(CO)8-Mediated and -Catalyzed Carbonylation of Diaryl Diselenides and Ditellurides to Seleno and Telluro Esters.

ChemInform Abstract

The diaryl diselenides (Ib), (Id), and the ditellurides (Ic) and (Ie) react with CO (II) in the presence of Co₂(CO)₈ to give the corresponding seleno esters (IIIb) and (IIId) or telluro esters (IIIc) and (IIIe), together with a small amount of the monoselenides and monotellurides (IVb) - (IVe). The benzoylcobalt tetracarbonyl (VIII) is supposed to be an intermediate in these reactions. It is synthesized independently from sodium cobalt tetracarbonyl (VI) and benzoyl chloride (VII) and reacts with (Ib) or (Ic) to yield the products (IIIb) or (IIIc).