Nitric Acid → HCID 14838331, compound

Participants

Reaction Conditions

Reaction Steps

To a mixture of 40 ml of nitric acid and 40 ml of sulfuric acid cooled to 5° C. by means of an external ice bath were added 10 g of 4-chloro-2,2-di-methyl-2,3-dihydro-7-benzofurancarboxylic acid over a period of 28 minutes. After stirring at 5° C. for 10 minutes, the mixture was added to ice with stirring. The resulting solid was collected by filtration and washed with water. After air drying, the residue was crystallized twice from ethyl acetate/hexane to provide 3.5 g of the desired subtitle intermediate, m.p. 260°-262° C.

Provenance & Evidence