oxygen; 1,8-diazabicyclo[5.4.0]undec-7-ene; 13,17-bis(2-carboxylatoethyl)-3,8-bis[1-hydroxyethyl]-2,7,12,18-tetramethylporphine in tetrahydrofuran T=0°C; 0.5 h; Irradiation;

oxygen; 1,8-diazabicyclo[5.4.0]undec-7-ene; hematoporphyrin IX in tetrahydrofuran T=0°C; 0.5 h; Irradiationwithout DBU; Mechanism;

ammonium hydroxide; copper diacetate; sodium hydride 1.) 0 - 100 deg C, 15 - 20 min, 2.) THF, 2 h; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;