Hypoiodous acid, preparation

It also may be prepared by treating hypoiodous acid with a base ... 

Similarly, the oxidation of iodocyclohexane by DMD under a nitrogen-gas atmosphere leads to the iodohydrin and diol as unexpected products (equation 24). The iodohydrin, formed as the major product, clearly reveals that hypoiodous acid (HOI) is generated in situ, which adds to the liberated cyclohexene. Indeed, when methyl iodide (Mel) is oxidized by DMD at subambient temperature in the presence of cyclohexene, the corresponding iodohydrin is obtained in very good yield The latter method may be utilized for the preparation of allylic alcohols with a vinylic iodo functional group from allenes (equation 25) . ... 

A. J. Balard found mercury immediately decomposes hypochlorous acid without the disengagement of any gas, but mercury oxychloride is formed. P. Grouvelle reported previously that when chlorine acts on mercuric oxide suspended in water, mercury oxychloride, very slightly soluble in cold water, is formed. L. J. Thenard found that the liquid contained both chloride and chlorate of mercury, also in soln. A. J. Balard, however, believed that these bodies are formed consecutively, and that their existence was preceded by that of a mercuric hypochlorite, as takes place with the salts of silver, and, as previously indicated, he prepared hypochlorous acid by the action of chlorine on mercuric oxide suspended in water. No mercury hypobromite has yet been isolated. There is a possible formation of mercury hypoiodite, or more probably of hypoiodous acid, when iodine is shaken up with... 

Hypoiodous acid is reported to be the sole iodine species capable of the iodination of phenols (Cofman, 1919). The iodophenol bed was over 90% efficient for trapping HOI (prepared by sparging from a dilute alkaline iodine solution) and less than 1% efficient for CH3I. Voilleque (1979) used this sampler to analyse effluents from Boiling Water Reactors and found 131I to be 11% particulate, 38% I2, 29% HOI and 22% organic. 

Iodine is still commonly used in liquid and sofid forms for use in emergency preparation of drinking water sources. The solid forms are sold commercially by various vendors, and are widely distributed by the U.S. Army for use in austere environments. The U.S. Army iodine water purification tablets release 8 mg/1 iodine per tablet (Department of the Army, 2002). Current guidefines specify two tablets per 1-quart canteen of water with a minimum contact time of 35 min to disinfect and prevent giardiasis (Department of the Army, 2002). Among the species of iodine, elemental iodine (fy) and hypoiodous acid (HIO) are the forms with the greatest biocidal efficacy (White, 1999). At pH 8.0 and 25°C, the concentrations of fy and HIO are approximately equal (Snoeyink and Jenkins, 1980). 

OL-Iodo ketones, a-lodo ketones are usually prepared by reaction of enol acetates with NIS. A new method involves reaction of an alkene with silver chromate and iodine in the presence of pyridine. The actual reagent is presumably a mixed anhydride of hypoiodous acid and chromic acid. Dichloromethane is the most useful solvent. ... 

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