A general method for the conversion of ethers, alcohols, and olefins into iodides by reaction with potassium iodide or sodium iodide and phosphoric acid has been described. Both the rates of reaction and the yields of iodide obtained from ethers, alcohols, and olefins are markedly influenced by the concentration of the orthophosphoric acid used.Columbus 10, Ohio

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1,6‐Diiodohexane reactant: 59 g. (0.5 mole) of recrystallized 1,6‐hexanediol product: 1,6‐diiodohexane

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