oxygen; 5,15,10,20-tetraphenylporphyrin in tetrachloromethane T=5°C; 1 h; Irradiation;

<b>Multi-step reaction with 2 steps<br /> </b>1: POCl₃ <br />2: (i) KOtBu, tBuOH, (ii) /BRN= 1868308/<br /> <br /> &nbsp;