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0 °C

Following the procedure described in Journal of Organic Chemistry (1972), 37(18), 2849-53, 0.5 g (2.62 mmol) of 3-methoxy-5-trifluoromethyl-phenylamine was suspended in 4.6 ml of 25% aqueous HCl, cooled (0° C.) and carefully treated (without exceeding 10° C.) with 0.189 g (2.75 mmol) of sodium nitrite dissolved in 2.7 ml of water. The solution was stirred for 1 h at this temperature and 30 min at RT. Then, 2.48 g (13.08 mmol) of tin(II) chloride in 2.5 ml of 25% aqueous HCl were dropped carefully to the cooled (0° C.) solution and stirred for 1 h. The reaction was neutralized and basified with 32% aqueous NaOH (pH14), partitioned three times between CH2Cl2 and water. The organic phase was dried over Na2SO4 and evaporated to give 0.50 g (93%) of the title compound as a yellow solid. MS: 206.8 (MH+).

1. temperaturecooled (0° C.) solution
2. stirringstirred for 1 h
3. custompartitioned three times between CH2Cl2 and water
4. dry with materialThe organic phase was dried over Na2SO4
5. customevaporated