Reaction of ethyl diazoacetate with cobalt porphyrins. Part 3. Structure and reactions of the 2 :1 adducts

Abstract

Isomers of the neutral 2 :1 adducts, containing either co-ordinated nitrate or acetate, from condensation of ethyl diazoacetate with cobalt octaethylporphyrin are described; the structure of the main nitrato isomer has been established by X-ray crystallography. The nitrogen–carbon–cobalt bridges of the neutral adducts can be broken by reduction, to give trans-2-21,22-bis(ethoxycarbonylmethyl)octaethylporphyrin, or by acids, to give salts of 21,22-bis(ethoxycarbonylmethylene)-23-(ethoxycarbonylmethyl)octaethylporphyrin, both isolated as perchlorates.