oxygen; 5,15,10,20-tetraphenylporphyrin; acetic acid 1.) chloroform, photoirradiated with 500 W halogen lamp, 1 h; 2.) reflux, 2 h; Yield given. Multistep reaction;

dirhodium tetraacetate; dimethyl diazomalonate in dichloromethane 2 h;

3-chloro-benzenecarboperoxoic acid in dichloromethane T=0°C; 1 h;