Nitration of 2-nitrotoluene using nitric acid, acet ic anhydride and Hβ zeolite produces a 97% yield of 2,4-dinitotoluene along with 3% of 2,6-din itrotoluene. Nitration of 4-nitrotoluene under similar reaction conditions produces 2,4-dinitrotol uene in 89% yield. When chloroacetic anhydride was used instead of acetic anhydride, nit ration of 4-nitotoluene produced a quantitative yield (>99%) of 2,4-nitrotoluene.

Nitration of 2-nitrotoluene with nitric acid, acetic anhydride and H zeolite produces 2,4-dinitotoluene in 97% yield, while using chloroacetic anhydride for 4-nitrotoluene yields 2,4-

Paper

Regioselective nitration of 2- and 4-nitrotoluenes over systems comprising nitric acid, an acid anhydride and a zeolite

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