H3PW12O40 catalyzed liquid phase nitration of aromatics-a green process without using H2SO4

Lianhai Lu, Junna Xin, Chang-Soo Woo, Tianxi Cai and Ho-In Lee.  2006.  H₃PW₁₂O₄₀ catalyzed liquid phase nitration of aromatics-a green process without using H₂SO₄. Studies in Surface Science and Catalysis, 159(6): 353-356.