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When pyridine (4 moles) is heated at 130° in fuming sulphuric acid with bromine (1 mole), 1.6‐1.8 moles of pure 3‐bromopyridine are formed according to the equation 2 C5H5N + 2 SO3 + Br2 → 2 C5H4BrN + SO2 + H2SO4. The reaction product contains but a small amount of dibromopyridines (less than 0.1 mole), 2,5‐dibromopyridine being the chief component in the mixture. The reaction products were analysed semiquantitatively by gas chromatography.
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Does et al. (1962) studied this question.
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