Generally, aromatic hydrocarbons or their corresponding substituted derivatives uponinteraction with bromine in the absence of light (dark) but in the presence of specific halogencarriers, namely : iron, iodine, pyridine or aluminium amalgam invariably result into the formation of appropriate bromo-substituted derivatives. At an initial stage a mono-bromo derivative is formed which on subsequent treatment with bromine ultimately give rise to the formation of the respective polybromo derivative.
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