3-chloro-benzenecarboperoxoic acid in dichloromethane 1.) 5 - 10 deg C, 30 min, 2.) RT, 2.5 h;

tert.-butylhydroperoxide; bis(acetylacetonate)oxovanadium in decane; dichloromethane T=0 - 23°C; 3 h; Inert atmosphere;

1: 1.) magnesium / 1.) ether, 2.) RT, 30 min 2: 80 percent / m-chloroperbenzoic acid / CH2Cl2 / 1.) 5 - 10 deg C, 30 min, 2.) RT, 2.5 h View Scheme

1.1: magnesium; iodine / diethyl ether / 1 h / |Inert atmosphere; |Reflux 1.2: 1 h / 23 °C / |Inert atmosphere 2.1: bis(acetylacetonate)oxovanadium; tert.-butylhydroperoxide / dichloromethane; decane / 3 h / 0 - 23 °C / |Inert atmosphere View Scheme

2: m-ClC6H4CO3H View Scheme

pyridine T=0°C; 3 h;

1: 89 percent / pyridine / 3 h / 0 °C 2: 78 percent / acetonitrile / 16 h / 150 °C 3: 95 percent / diethyl ether / 1.5 h / Ambient temperature View Scheme