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We have studied the effect of the substituent nature on nitration of 4′-R-dibenzo-18-crown-6 (DB18C6, where R is NO2, CH3CO, or C2H5) in polyphosphoric acid (PPA). We also studied the influence of cations' nature on regioselectivity of nitration. It was found that electron withdrawing substituents direct the incoming NO2-group mainly to the 4″-position of the unsubstituted benzene ring in the reactions...
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