R. Iqbal et al., NITRATION OF SOME SUBSTITUTED AROMATIC-COMPOUNDS WITH POTASSIUM-NITRATE IN POLYPHOSPHORIC ACID, Journal of the Chemical Society of Pakistan, 19(2), 1997, pp. 141-144
Some 4-substituted benzaldehydes, 4-substituted benzoic acids and subs
tituted nitrobenzenes were subjected to nitration using potassium nitr
ate in polyphosphoric acid. The method was found useful to obtain sing
le nitro-product in each case.