Nitration of 4-methyl or 4-aminobenzoic acid was studied and two leadsaIts of aromatic carboxylic acids containing nitro groups were synthesized. It was found that nitration of aromatic carboxylic acids containing a strong electron donating group in the 2- or 4-position of the aromatic ring at 70~75℃ in sulfuric acid with excess of nitricacid gave trinitroproducts via IPSO nitration.
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魏运洋,王玉.几种芳香酸的硝化及其铅盐的合成研究[J].含能材料, 1995, 3(3):28-33. Wei Yun-yang, Wang Yu. NITRATION OF SOME AROMATIC CARBOXYLIC ACIDS AND PREPARATION OF THEIR LEAD SALTS[J]. Chinese Journal of Energetic Materials, 1995, 3(3):28-33.