1: With pyridinium chlorochromate; sodium chloride in dichloromethane 3 h; 2: With phosphorus pentachloride; sodium hydrogencarbonate in dichloromethane; water T=20°C; 4.33333 h;

1.1: toluene-4-sulfonic acid / ethanol; water / 72 h / Inert atmosphere; Reflux 2.1: pyridinium chlorochromate; sodium chloride / dichloromethane / 3 h 2.2: 4.33 h / 20 °C View Scheme

Yield given. Multistep reaction;

1: With N-bromosuccinmide; 2,2'-azo-bisisobutyronitrile in tetrachloromethane 24 h; Inert atmosphereReflux; 2: With hydrogenchloride; water in 1,4-dioxane 2 h; Reflux;