| 摘要 |
1,207,384. Nitration of aromatic compounds. BOFORS A.B. 20 Oct., 1967 [20 Oct., 1966], No. 47947/67. Heading C2C. Mono-alkyl substituted nitro compounds are nitrated with nitric acid in the presence of phosphoric acid, the amount and concentration of which is such that at the conclusion of the nitration the P 2 O 5 content in the spent acid does not exceed 82% by weight, preferably 76% by weight. In the examples (a) toluene is nitrated to give mainly o-and p-nitrotoluene with small amounts of m-nitrotoluene; (b) ethyl benzene is nitrated to give mainly o- and p-nitroethylbenzene; (c) isopropyl benzene is nitrated to o- and p-nitro isopropylbenzene; (d) o-nitrotoluene is nitrated to give 2,4- and 2,6-dinitrotoluene; and (e) m-nitrotoluene was nitrated to give 3,4-, 2,3- and 2,5-dinitrotoluene. |
