Method for nitration of substituted benzene to substituted nitrobenzene for use in production of chemicals, pharmaceutical products and plant protection agents, involves carrying out nitration in presence of propionic acid

摘要

Substituted benzene nitration method involves carrying out nitration in presence of 50-5000 wt.% propionic acid, 1-20 wt.% of a strong mineral acid and 10-100 wt.% of a water bound substance from propionic acid anhydride, acetic anhydride, phosphorous pentoxide or sulfur trioxide in which substituted benzene is converted to substituted nitrobenzene. Substituted benzene having formula (I) and substituted nitrobenzene having formula (II), are new. R1, R2, R3, R4 : -H, -OR', -NHR'', -alkyl, -cycloalky aryl, -halogen, -trihalogen methyl, -COOR' , -COR' or -CN stand, where R' is -H, -alkyl, -aryl stands, with the same substituents as R1-R4, and R'' is -COR' stand. [Image] [Image].