ortho-methylbenzoic acid T=150°C; 3 h;

1: 95 percent / TosOH / benzene / Heating 2: 72 percent / KOtBu / dimethylsulfoxide / 48 h / 80 °C 3: 95 percent / o-CH3-C6H4-COOH / 3 h / 150 °C View Scheme