Iodide oxide

Methyldiaziridine and 3-n-propyldiaziridine (45) give with benzoyl chloride the dibenzoyl compounds 48 and 49. Both compounds are shown to be true diaziridines by oxidizing iodide. This discovery was of special interest the sole compounds retained in recent literature- of those formerly formulated as diaziridines were supposedly 1,2-diacyl-diaziridines, e.g. 50 [compare Section I, Eq. (1)]. 

Sfi.f-Test K.4B In aqueous solution, cerium(lV) ions oxidize iodide ions to solid diatomic iodine and are themselves reduced to cerium(III) ions. Write the net ionic equation for the reaction. 

The s-triazines undergo chlorination at nitrogen to yield reactive N-chloro derivatives which oxidize iodide to iodine in the second step. This then forms an intense blue iodine-starch inclusion complex with starch. 

Primary and secondary amines and amides are first chlorinated at nitrogen by the chlorine released by the gradually decomposing calcium hypochlorite. Excess chlorine gas is then selectively reduced in the TLC layer by gaseous formaldehyde. The reactive chloramines produced in the chromatogram zones then oxidize iodide to iodine, which reacts with the starch to yield an intense blue iodine-starch inclusion complex. 

Treatment with chlorine gas converts amines to chloramines, whose active chlorine oxidizes iodide to iodine. This then forms the well-known, deep blue iodine-starch complex [13]. 

Substances containing active chlorine or bromine oxidize iodide ions — if necessary under the influence of UV light - to iodine, which reacts with starch to yield the well-known intense blue starch-iodine inclusion complex. 

At the end of this period the solution was removed from the condenser while still hot and titrated immediately with 0.002500 N sodium thiosulfate before any appreciable oxygen could be absorbed and oxidize iodide ion to triiodide ion. The disappearance of the yellow color of triiodide ion against a white background was used for the end point. These solutions usually had a slight brown tint at the end point, which was assumed to be organic matter distilled over from the soil. Accordingly, the blank was usually titrated first and its final color was used as a standard end point color for the other three solutions run with it. 

The products of perfluorination are both white, very different from the original black hydrocarbon polymers. Both materials are moisture-sensitive powders and slowly degraded by atmospheric moisture, 6 more quickly than 5. The materials oxidize iodide ion to iodine owing to the presence of the N—F moiety. A series of iodometric titrations showed that 6 required twice the number of equivalents of titrant as did 5. This result supports the proposed structures 6 having twice as many N—F moieties as 5. 

The liberated bromine helps in oxidizing iodide to an equivalent amount of iodine as shown below ... 

Figure 4.5 Formation of MIT and DIT. Thyroid peroxidase (TPO) oxidizes iodide and incorporates iodine into tyrosine residues within Tgb...

Neither Cr(VI) nor Fe(III) can oxidize iodide ions rapidly. However a mixture of Cr(VI) and Fe(II) forms iodine rapidly from iodide ions. The oxidation of I is said to be induced by the Fe(II) — Cr(VI) reaction. At high [I ]/[Fe ] ratios, the induction factor (ratio of H oxidized per Fe + oxidized) is 2.0. Interpret this behavior, detailing the intermediates involved. 

In acetate buffer (pH 4), active chloride stoichiometrically oxidizes iodide to iodine, so that this sensor can be used to determine the concentration of active chlorine. This method is useful for the determination of active chlorine in the range, 3-100 ppb. 

Manganese(lV) oxide is an oxidizing agent. In acid medium, it oxidizes iodide to iodine ... 

HNO2 + H2S S + 2NO + 2H2O HNO2 + 3H2S 3S + NH3 + 2H2O In acid medium it oxidizes iodide ion to iodine ... 

Simdar reactions occur with zinc, magnesium, aluminum, and iron. Concentrated sulfuric acid oxidizes iodide to iodine and bromide to bromine ... 

By definition POV is the number of miliequivalents of active oxygen per kilogram of sample" , or in some cases the number of micrograms of active oxygen in one gram of sample, capable of oxidizing iodide to iodine" °°. Many of the methods described in Section V for determination of hydroperoxide classes or individual compounds can also be applied for determination of POV, as total hydroperoxides. The iodometric determination of hydroperoxides in lipids and proteins has been reviewed . 

It follows from reactions 15.11 and 15.20 that copper(II) ion can oxidize iodide to iodine, and from reactions 15.11 and 15.21 that thiosulfate can reduce I2 back to I- while forming the tetrathionate ion (Section 3.4). Because the relevant AE° values are several hundred millivolts, the equilibrium constants are large, and these reactions go to essential completion. 

From the E° of half-reaction 15.22, it would seem that the nitrate ion present from the dissolution of the brass should also oxidize iodide ion. This E° value, however, refers to standard conditions, which implies 1 mol L 1 H+, whereas we have adjusted the pH to near neutrality. Suppose the pH is adjusted to 7.0, that is, [H+] = 1 x 10 7 mol L 1, while [N02-] and [N03-] retain their standard-state values of unity the corresponding EMF for the half-reaction 15.22 is then... 

It is not hydrolysed by water but reacts quantitatively with NaOH to yield sodium perchlorate and fluoride. It oxidizes iodides to iodine. Perchloryl fluoride reacts with ammonia to yield ammonium perchlorylamide NH4NHCIO3 [45a]. It reacts with potassium and caesium hydroxide to yield crystalline precipitates of K2NCIO3 and CS2NCIO3. It is isomorphous with metal sulphates, is explosive and very sensitive to flame, shock and friction. 

Iodic ucid. HIOi. is commonly prepared by oxidizing iodine with HNOr. Il is a strongly oxidizing acid, oxidizing iodide to iodine, xulhtc to sulfate, and H S to sulfur, It reacts vigorously even w ith dry carbon, phosphorus, or organic matin, ... 

Peroxides in general (ROOH) can be measured by titrimetric methods based on their oxidation potential to oxidize iodide (L) to iodine... 

Ozone is an extremely powerful oxidizing agent. In fact, of the common oxidizing agents, only F2 is more potent. A standard method for detecting ozone in polluted air is to pass the air through a basic solution of potassium iodide that contains a starch indicator. The ozone oxidizes iodide ion to iodine, I2, which combines with the starch to give the deep blue starch-iodine complex ... 

Analogous to the preceding cw-dioxovanadium(V)-catalyzed system of bromide oxidation by dihydrogen peroxide, Secco carried out a detailed kinetic analysis of vanadate-catalyzed oxidation of iodide by dihydrogen peroxide [75], Peroxovanadate species (i.e., V0[02]+ and V0[02]2 ) or their hydronated forms oxidize iodide in acidic aqueous solution, forming V02+ and V0(02)+, respectively however, once V0(02)+ and V0(02)2 are consumed, iodide reduces... 

We wish to report here on the synthesis and biological properties of 0-[m-N,N,N-trimethylammoniophenyl"J 1,3,2-dioxa-phosphorinane 2-oxide iodide (TDPI I, X = TMPH). 

Reaction of peracetylated sugars with iodine in the presence of hexamethyl-disilazane has been reported to afford the corresponding glycosyl iodide.29 Glycosyl iodides have also been prepared by treatment of glycosyl chlorides or bromides with substoichiometric amounts of iodine and DDQ.30 In this instance, DDQ acts to oxidize iodide remaining after the initial attack on the electrophilic iodine. The benefit of this approach is to limit the amount of free iodide is solution, as recycling of iodine at the expense of DDQ is clearly not cost-effective. 

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