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

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Reaction Steps

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

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