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 3.1: N-bromosuccinmide; 2,2'-azo-bisisobutyronitrile / tetrachloromethane / 24 h / Inert atmosphere; Reflux 3.2: 2 h / Reflux View Scheme

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