Process for the mononitration of ortho-xylene

Details Process for the mononitration of ortho-xylene Process for the mononitration of ortho-xylene

C - Chemistry, Metallurgy

07

C

260/611

C07C 205/06 (2006.01) C07C 201/08 (2006.01)

Patent

CA 1038405

TITLE PROCESS FOR THE MONONITRATION OF ORTHO-XYLENE ABSTRACT OF THE DISCLOSURE There is provided a process for mononitrating ortho-xylene by reacting o-xylene with catalytic amounts of nitrogen tetroxide (N2O4) or nitrogen dioxide (NO2) and concentrated nitric acid in concentrations of at least 68% in the presence of a mercuric salt and an aliphatic mono- carboxylic acid anhydride to obtain good yields of mono- nitrated o-xylene having an isomer distribution of at least a 70:30 ratio of 4- to 3- nitro-o-xylenes. Such 4- nitro- o-xylene, upon separation from the isomeric mixture, finds utility in the preparation of xylidine derived preemergence herbicides.

228480

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