Synthesis, structure and reactivity of acetylenic Co2(CO)6 pyrylium salts. Electronic influence of the Co2(CO)6 acetylenic fragment

Article abstract of DOI:10.1016/S0022-328X(97)00156-3

The formation of new pyrylium salts bearing in the 7 position an acetylenic Co₂(CO)₆ fragment is described. X-ray analysis showed that the γ carbon of the pyrylium ring does not interact with a cobalt atom. However, IR values, relating to the carbonyl stretching band, suggested that a part of the positive charge is delocalized on the cluster core. Finally, the reactivity of these cationic complexes towards nucleophiles is reported.