The use of mixed solvents, toluene and acetonitrile in a ratio of 2 : 1, in the iodine (or tri-iodoimidazole)–imidazole–triphenylphosphine halogenation system allows certain transformations of hydroxy-groups into deoxyiodo-groups which were difficult to achieve in the original system using toluene alone.
P. J. Garegg, R. Johansson, C. Ortega and B. Samuelsson, J. Chem. Soc., Perkin Trans. 1, 1982, 681 DOI: 10.1039/P19820000681
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