1: 1.) tetrazole / 1.) vacuum, 1 h, 2.) CH3CN, THF, 30 min 2: t-butyl hydroperoxide / toluene / 10 h / Ambient temperature 3: Me3N / toluene / 20 h / 50 °C 4: Zn, CH3COOH / 9 h / 45 °C View Scheme

1: 1.) tetrazole / 1.) vacuum, 1 h, 2.) CH3CN, THF, 30 min 2: t-butyl hydroperoxide / toluene / 10 h / Ambient temperature 3: Me3N / toluene / 10 h / Ambient temperature View Scheme