反应详情

To a solution of 4-hydroxymethyl-2-trifluoromethyl-benzoic acid methyl ester (Example I9) (7.15 g) in dichloromethane (150 ml) was added manganese dioxide (25.1 g). The reaction mixture stirred at ambient temperature for 2.5 hours. The reaction mixture was filtered over a plug of silica gel and the filtrate concentrated to give 4-formyl-2-trifluoromethyl-benzoic acid methyl ester (5.98 g), which was used without further purification. 1H-NMR (CDCl3, 400 MHz): 10.11 (s, 1H), 8.25-7.59 (m, 3H), 3.98 (s, 3H).

1. filtrationThe reaction mixture was filtered over a plug of silica gel
2. concentrationthe filtrate concentrated