Iodine reaction with chlorine

Trichloroacetone [921-03-9] (13a) is prepared by chlorination of acetone. The reaction is nonselective and the required compound is isolated by distillation. The selectivity has been improved by catalyzing the reaction with iodine (31). 

The ketene as a more reactive species is iodinated by reaction with iodine. Bromine or chlorine as substituents may also be introduced by this method. ... 

The first reported porphyrin complexes of platinum(IV) date from 1980 and were obtained by hydrogen peroxide oxidation of platinum(II) porphyrin complexes in an acidic medium (HC1).479 Since then oxidation of platinum(II) complexes of other porphyrins has been achieved by the same method,480 and by chlorine,481 or bromine482 oxidation. Reaction with iodine did not lead to oxidation and treatment of platinum(IV) porphyrin complexes with iodide resulted in reduction to platinum(II). 

Reaction with iodine forms iodine monochloride, ICl which combines with excess SbCls to form adducts, SbCR 2IC1 and SbCls 31 Cl similarly reaction with chlorine trifluoride, CIF3 gives antimony dichlorotrifluoride, SbCbFs. 

The reaction is explosive with fluorine and occurs under all conditions. With chlorine and bromine reaction occurs rapidly when exposed to light, undergoing a photochemical chain reaction. With iodine, the reaction is very slow, even at elevated temperatures. Hydrogen is a strong reducing agent. At high temperatures, the gas reduces many metal oxides to lower oxides or metals ... 

Explain the secondary reaction of the foregoing preparation in which chlorine reacts with iodine. 

Synthetic procedures are available for the preparation of fluoro (e.g., 2-lithio-l-methyl-5-octylpyrrole with fV-fluoro-iV-(phenylsulfonyl)benzenesulfonamide <2003JFC(124)159>), chloro, bromo, and iodo compounds from the corresponding lithio derivatives, for example, 2-iodobenzo[A]furan via lithiation of the heterocycle then reaction with iodine <2002JOC7048>. Perchloryl fluoride (FCIO3), A-chlorosuccinimide, bromine, and iodine are examples of reagents which can be used to introduce fluorine, chlorine, bromine, and iodine, respectively. 

Complexes containing from one to six carbonyl groups are known and all obey the 18-electron rule. The colorless salt [Tc(CO)6]A1C14 is formed by the reaction of [Tc(CO)5C1] with A1C13 under 300 atm CO pressure and is soluble in THF, acetone, and methanol and stable in aqueous solution (65). The carbonyl halides [Tc(CO)5X] (X = Cl, Br, I) may be prepared by the reaction of the halogen with [Tc2(CO)10]. Reaction with chlorine and bromine occurs readily at room temperature but reaction with iodine is extremely slow. The iodide has been prepared by the high-pressure carbonylation of [Tc(CO)4I]2 (45). An alternative... 

OrganometaUic complexes of any type are thermodynamically unstable with respect to oxidation and this is true of metal metal bonded complexes as well. Reaction with oxygen or chlorine wUl ultimately lead to the metal oxide or chloride. Milder oxidizing agents cleave the metal metal bond selectively, leaving the other bonds intact. For example, reaction with iodine is often a fast, clean reaction (equation 78). 

There are several examples of metal carbonyls containing a Tc(CO)5 fragment. The carbonyl halides Tc(CO)sX (X = Cl, Br, and 1) may be prepared by the reaction of the halogen with Tc2(CO)io. The reaction with chlorine or bromine occurs readily at room temperature but the reaction with iodine is very slow. The IR spectra of these compounds have shown three v(C-O) bands expected for C4 symmetry, between 2153 and 1991 cm. Several other technetium carbonyl halide species have been identified by... 

Reaction rates of CIO2 with chlorine have been calculated from Bray s measurements on the reverse reaction. Bray showed that the rate of the corresponding reaction with iodine is small and decreases with acid concentration. He proposed that the process involved HIO as reactant. 

Tellurophene and substituted tellurophenes react with bromine to give Te,Te-dibromides, as do dialkyl and diaryl telluriums. Tetrachlorotellurophene and chlorine combined to produce tetrachlorotellurophene Te.Te-dichloride in quantitative yield". The corresponding reactions with iodine have not been investigated. The dibromides are reduced to tellurophenes by aqueous sodium hydrogen sulfite or zinc powder in glacial acetic acid. ... 

The corresponding reaction with iodine or ICl, however, gives a more complex mixture of products including the expected alkyl iodide. Monofluorophosphites are converted by chlorine into alkylphosphoro-chlorofluoridates (R0)P(0)FC1 (137), and also undergo an Arbuzov... 

Addition-products are also formed with chlorine and with iodine. The difference in the readiness with which ethylene chloride and ethylene iodide are formed illustrates clearly the difference in the activity of the two halogens. In the case of chlorine the reaction must be carried out in the dark and the temperature... 

As distinct from chlorine and bromine, elemental iodine did not react with 226 under the same conditions. Only 6-iodo-l,3-dimethyl-IbP-2-one 353 formed in a reaction with iodine monochloride. 

Lengyel, I. Rabai, G. Epstein, 1. R. 1990a. Batch Oscillation in the Reaction of Chlorine Dioxide with Iodine and Malonic Acid, J. Am. Chem. Soc. 112, 4606-4607. 

Halogenation of alkenes is only practical for the addition of chlorine or bromine. The reaction with fluorine is too violent, and the reaction with iodine often produces very low yields. 

The facile reaction of octaphenylcyclotetrasilane with halogens was first discovered by Kipping, who observed the rather surprising reaction with iodine. Octaphenylcyclotetrasilane has also been found, not unexpectedly, to be more reactive with bromine in benzene. If equimolar amounts of reactants are used, the product is 1,4-dibromooctaphenyltetrasilane (17) however, if two moles of bromine to one of octaphenylcyclotetrasilane are used, 1,2-dibromotetraphenyldisilane (37) can be isolated in yields up to 85%. Chlorine quantitatively cleaves the cyclotetrasilane in carbon tetrachloride within minutes to give 1,4-dichlorooctaphenyltetrasilane. ... 

The diazonium salts usually decompose when warmed with water to give a phenol and nitrogen. When treated with CuCl, CuBr, KI, the diazo group is replaced by chlorine, bromine or iodine respectively (Sandmeyer reaction). A diazonium sulphate and hydroxyl-amine give an azoimide. The diazonium salt of anthranilic acid (2-aminobenzoic acid) decomposes to give benzyne. ... 

White and red phosphorus combine directly with chlorine, bromine and iodine, the red allotrope reacting in each case at a slightly higher temperature. The reactions are very vigorous and white phosphorus is spontaneously inflammable in chlorine at room temperature. Both chlorine and bromine first form a trihalide ... 

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