prov:value
| - ming nitric acid in the presence of concentrated sulfuric acid in a solvent.Such a solvent includes, for example, ether solvents such as diethyl ether, 1,2-dimethoxyethane, tetrahydrofuran, diglyme, and such; halogen solvents such as dichloromethane, chloroform, carbon tetrachloride, 1,2-dichloroethane, and such; estersolvents such as ethyl acetate, methyl acetate, butyl acetate, and such; alcohol
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