Porphyrins and their derivatives: XXV. Reaction of 2-formyl-5,10,15,20-tetraphenylporphyrin with diazomethane

2-Formyl-5,10,15,20-tetraphenylporphyrin and its copper and zinc complexes react with diazomethane in a mixture chloroform-alcohol providing the corresponding 2-acetyl-and 2-acetonyl derivatives. In a pure chloroform main product of diazomethane reaction with 2-formyl-5,10,15,20-tetraphenylporphyrin is 2-acetyl-5,10,15,20-tetraphenylcyclopropa[b]chlorin.