Abstract The results from our thorough investigation of different catalystic effects on the rate and yields of complexation of arenes with Cr (CO) are presented with a short review of the subject. With decalin as solvent the following substances were found to be the best catalysts: butyl acetate, ethyl formate, and dimethyl succinate. Butyl acetate proved to be the catalyst also in-di-n-butyl ether. Special attention was paid to the complexation of naphthalene, ...