The preparation of 3:5-dinitrobenzoic acid and 3:5-dinitrobenzoyl chloride

Abstract

3:5-Dinitrobenzoyl chloride was suggested by one of us [Saunders, 1934; The preparation of this reagent has now been examined in detail. The two recorded preparations of 3:5-dinitro- benzoic acid from benzoic acid The second author heated the mixture on a water bath for 12 hr., poured into water and then re- peated the nitration on the product for a further 12 hr. Details are given below, for the preparation of 3:5-dinitrobenzoic acid in which, by careful temperature control, the period of nitration for a corresponding weight of benzoic acid has been reduced to 22-hr. Moreover, Sirks's yield has been improved upon and the quantities of nitrating acid used by Shukow have been reduced by 15 %.