1- Bromo-2,4-dinitrobenzene

Bromo-2,4-dinitrobenzene [584-48-5] M 247.0, m 75 . Crystd from ethyl ether, isopropyl ether, 80% EtOH or absolute EtOH. 

C6H3BrN204 1-bromo-2,4-dinitrobenzene 584-48-5 593.15 52.902 2 6353 C6H3HgN2Na06 sodium-2-hydroxymercurio-6-nitro-4-aci-nitro. .. 369.65 31.515 1,2... 

Quantitative (100%) yields for the formation of o -complexes were observed, since no reduction waves for nitroarenes have been observed in the first cathodic scan. When two o -complexes are present in solution, two waves in the first anodic scan have to appear (two-electron-irreversible oxidation wave for each compound). For l-fluoro-2,4-dinitrobenzene, l-chloro-2,4-dinitrobenzene, and 1-bromo-2,4-dinitrobenzene, two types of o -complexes have been identified, probably 1,3- and 1,5-adducts. The oxidation peak potential (Epa) is mainly dependent on the number of electron-withdrawing groups Epa increases with the number of nitro-or cyano groups available in an aromatic ring. Exhaustive electrolysis of o -complexes (by the loss of two electrons and one proton) leads to the corresponding nitroarene in 100% yield. 

Make the spots visible by placing the dry plate under an ultraviolet (UV) lamp or in a chamber whose atmosphere is saturated with iodine vapor. Calculate the RfValues of the spots observed, and identify them as either 2- or 4-bromonitroben-zene. A small orange spot may be observed very near the origin of the chromatogram this spot is 1-bromo-2,4-dinitrobenzene. 

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