Abstract
Complexes of quaternary salts with SO2 are formed on saturation of aqueous solutions of alkyl halide salts of nitrogen-containing heterocycles with sulfur dioxide. The SO2 concentration necessary for the precipitation of the complexes increases in the order I < Br < Cl and decreases as the alkyl group attached to the nitrogen becomes larger. The sulfur dioxide in the complexes is bonded through the halide ion by a “charge-transfer” coordinate bond, and their separation into an independent phase is due to a change in the degree of hydration during complexing. Several crystalline adducts are described, and the autooxidation of the SO2 complex of pyridine methiodide is investigated.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 966–969, July, 1972.
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Shlyapnikov, D.S. Reaction of alkyl halide salts of nitrogen-containing heterocycles with sulfur dioxide in aqueous solutions. Chem Heterocycl Compd 8, 879–882 (1972). https://doi.org/10.1007/BF00475224
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DOI: https://doi.org/10.1007/BF00475224