Bis iodine

Bis(iodosyl)benzene reacted with triflic anhydride to afford a bis iodine (III) derivative [21], DIB or iodosylbenzene, however, do not afford with triflic acid, or its anhydride, the expected analogues of HTI, although these are initially formed. The reaction of iodosylbenzene and triflic anhydride leads to two different products, depending on reaction time. When triflic acid was allowed to react with iodosylbenzene in dichloromethane for about 20 min the yellow p-compound 1 (m.p. 100-110°C) was obtained it was the same with the so-called Zefirov s reagent, which was originally prepared from DIB and triflic acid in chloroform. When the reaction time was extended to 12 h, then 1 isomerized to the slightly pale yellow compound 2 (m.p. 125-132°C). For preparative purposes the direct reaction of iodosylbenzene with triflic acid was preferable for 2, since it was isolated in 94% yield. 

Use the periodic table to draw Lewis structures for the following elements barium (Ba), gallium (Ga), tin (Sn), bismuth (Bi), iodine (I), cesium (Cs), krypton (Kr), xenon (Xe). 

H3 6CI2N10O15RU2, M Oxo-bis(nitrobis(2,2 -bipyridine)ruthenium-Ull)) perchlorate dihydrate, 41B, 1097 CuoHa sFelsNeOu, Bis(diphenylglyoximato)-bis(/J-picoline)iron(III) iodide bis(iodine), 43B, 1336... 

Compound 129, with R=Ph, p-MeCsH4, p-MeOC H, p-EtOC H, and 2-furyl, was obtained in 70 to 80% yield when p-phenylene bis-thiourea was heated with iodine and p-AcCaHjE, accxtrding to Method B (741). 

The synthesis of poly(arylene sulfide)s via the thermolysis of bis(4-iodophenyl) disulfide has been reported (78). The process leads to the formation of PPS and elemental iodine. This process presumably occurs analogously to that reported by Eastman Chemical Company. 

Dithionite is a stronger reducing agent than sulfite. Many metal ions, eg, Cu", Ag", Pb ", Sb ", and Bi ", are reduced to the metal, whereas TiO " is reduced to (346). Dithionite readily reduces iodine, peroxides, ferric salts, and oxygen. Some of the decolorizing appHcations of dithionite, eg, in clay bleaching, are based on the reduction of ferric iron. 

Boron Triiodide. Boron ttiiodide is not manufactured on a large scale. Small-scale production of BI from boron and iodine is possible in the temperature range 700—900°C (70—72). Excess I2 can be removed as Snl by reaction with Sn, followed by distillation (71). The reaction of metal tetrahydroborates and I2 is convenient for laboratory preparation of BI (73,74). BI can also by synthesized from B2H and HI in a furnace at 250°C (75), or by the reaction of B with excess Agl or Cul between 450—700°C, under vacuum (76). High purity BI has been prepared by the reaction of I2 with mixtures of boron carbide and calcium carbide at elevated temperatures. 

Bi,Sr,CaCu,03 g + (2y-12)T 2BF++ 2Sr -"+ Ca -"+ 2CuI + yO -+ (y-7)I, In this ease the exeess of aside solution and potassium iodide solution are added to analyzing eompound with eontinuous stirring. The generated iodine is titrated by Na3S,03 solution. The ealeulation of oxygen index (y) is eaiTying out by formula ... 

In recent years, tnflate derivatives of bivalent iodine have found more and more applications as versatile reagents in organic synthesis [7i5, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145] p.-Oxo-bi [(trifIuoramethanesulfonyloxy) (phenyl)iodine], which is readily available from lodosobenzene and tnflic anhydride (equation 44), is especially valuable for the preparation of alkynyl lodonium Inflates from silyl- or stannylacetylenes [136] (equation 70)... 

The 3,5-bis(trifluoromethyl)pyrazolate analog [Ir(cod)(/x-3,5-(CF3)2pz)]2 does not enter into oxidative addition with iodine, methyl iodide, or acetylenes. The mixture of pyrazolate and 3,5-bis(trifluoromethyl)pyrazolate gives [(rj -codllrf/x-pz)(/L-3,5-(CF3)2pz)Ir(rj -cod)], which reacts with bis(trifluoromethyl)acetylene in a peculiar manner [83JCS(CC)580], producing 145, where 3,5-bis(trifluoromethyl) pyrazolate is replaced by the ethylene bridge and the rj -coordination mode of one of the cod ligands is converted into the rj -allylic mode. 

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