Dicarbonyl chelates from 1-cymantrenylalkylamides: formation, properties, and kinetics of the dark reaction with carbon monoxide

Photolysis of carboxamides with aminomethyl-, 1-aminoethyl-, and aminobenzylcymantrenes led to six-membered dicarbonyl chelates with the Mn—O bond, which are stable in solutions. In the presence of carbon monoxide, the chelates undergo a dark reverse reaction with the formation of the starting tricarbonyl complexes. It was found that the rate determining step of the thermal reaction of the chelates with CO was the chelate ring opening according to the SN1 mechanism of ligand substitution.