Nitric Acid → 5,6-Dinitro-2-(2,2,2-trifluoroethyl)-2-(trifluoromethyl)-1,3-benzodioxole

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Reaction Steps

317 g of the product of Example 15a were introduced, and a mixture of 250 ml of 100% strength by weight nitric acid and 350 ml of concentrated sulphuric acid were added dropwise, with stirring. The mixture was stirred for 2 hours at 55° C. The batch was then allowed to cool and poured into ice-water. The product was extracted using methylene chloride, and the methylene chloride phase was washed until neutral using sodium hydrogencarbonate solution, dried and freed from readily volatile components on a rotary evaporator. The yield was 339 g (=94% of theory), and the melting point was 101° to 103° C.

Provenance & Evidence