1: 89 percent / 1.) BH3-THF, 2.) H2O2/NaOH 2: 69 percent / KO-t-Bu / dimethylsulfoxide; H2O / 1 h View Scheme

titanium(IV) isopropylate; 4 A molecular sieve; oxygen; 5,15,10,20-tetraphenylporphyrin in dichloromethane T=-10 - -5°C; 6 h; Irradiation;