Toluene Nitration Catalyzed by Keggin Heteropolyacid Anionic Brφnsted Acid Salt

A novel Keggin heteropolyacid anionic Brnsted acid salt [(CH2)4SO3HMim]H2PMo12O40 was synthesized and used as catalyst in toluene nitration in HNO3(67%) with good catalytic activity.With the molar ratio of toluene to nitric acid 1∶3,catalyst to toluene 1∶10,and reaction for 10 h at 50 ℃,the yield of mononitro products is about 84.9%,and the ratio of ortho-to para-isomers about 1.21.