FIELD: organic chemistry. SUBSTANCE: to reaction mass containing sulfuric acid, nitric acid, methylene chloride, adamantane and formic acid acetonitrile is added at ratio adamantane : sulfuric acid : acetonitrile = 1: (11-13):(0.6-0.7) (moles). Acetonitrile decreases sulfuric acid consumption, yield of 1-carboxyadamantane is increased from 92 to 98.5%. Synthesized product can be used as semiproduct for synthesis of polymers and bioactive compounds. EFFECT: increased purity and yield of product, decreased sulfuric acid consumption.
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