SYNTHESIS OF TRANSITION-METAL CARBOXYLATO COMPLEXES

The preparations in high yields of (carboxylato)pentaamminecobalt (III) complexes from hydroxopentaamminecobalt(III) by reaction with carboxylic acid anhydrides and p-nitrophenyl and 2,4-dinitrophenyl esters are described. The stereospecific synthesis of cis-and trans-bis(acetato) complexes from cis- and trans-diaquabis(ethylenediamine)cobalt(III), respectively, has been accomplished. The acylation reactions have been extended to the preparation of the (acetato)pentaammine complexes of Cr(III), Rh(III), and Ru(III). The solvolysis in DMF of aquapentaamminecobalt(III) induced by acetyl trifluoromethanesulfonate has been shown to proceed by a mechanism which involves retention of the oxygen atom of the aqua ligand. © 1979, American Chemical Society. All rights reserved.