Diels–Alder reactions of protoporphyrin dimethyl esters with nitrosobenzenes; a novel degradation to formyl porphyrins
Abstract
The reaction of the divinyl porphyrins, protoporphyrins-II and -IX dimethyl ester, with p-nitronitrosobenzene affords mono-vinyl mono-adducts, and with an excess of reagent mono-formyl mono-adducts.