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5. V. Galamb and G. P�lyi,XIIIth Hungarian Coll. Coord. Chem., May 1977, Sopron, Hungary. Results regarding (1), of R. F. Heck,J. Am. Chem. Soc., 84, 2499 (1962), could not be reproduced in the course of this study. Complexes (1) (L = CO) were prepared from NaCo(CO)4 and haloacetic acid esters in Et2O at 0?25�. Complexes (1) (L = MPh3) were prepared from (1) (L = CO) and MPh3 in n-hexane.