Silver, reaction with iodine

Vicinal iodo carboxylates may also be prepared from the reaction of olefins either with iodine and potassium iodate in acetic acid/ or with N-iodosuccinimide and a carboxylic acid in chloroform. " A number of new procedures for effecting the hydroxylation or acyloxylation of olefins in a manner similar to the Prevost or Woodward-Prevost reactions include the following iodo acetoxylation with iodine and potassium chlorate in acetic acid followed by acetolysis with potassium acetate reaction with iV-bromoacetamide and silver acetate in acetic acid reaction with thallium(III) acetate in acetic acid and reaction with iodine tris(trifluoroacetate) in pentane. ... 

The functionalization of zinc porphyrin complexes has been studied with respect to the variation in properties. The structure and photophysics of octafluorotetraphenylporphyrin zinc complexes were studied.762 Octabromoporphyrin zinc complexes have been synthesized and the effects on the 11 NMR and redox potential of 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetraarylporphyrin were observed.763 The chiral nonplanar porphyrin zinc 3,7,8,12,13,17,18-heptabromo-2-(2-methoxyphenyl)-5,10,15,20-tetraphenylporphyrin was synthesized and characterized.764 X-ray structures for cation radical zinc 5,10,15,20-tetra(2,6-dichlorophenyl)porphyrin and the iodinated product that results from reaction with iodine and silver(I) have been reported.765 Molecular mechanics calculations, X-ray structures, and resonance Raman spectroscopy compared the distortion due to zinc and other metal incorporation into meso dialkyl-substituted porphyrins. Zinc disfavors ruffling over doming with the total amount of nonplanar distortion reduced relative to smaller metals.766 Resonance Raman spectroscopy has also been used to study the lowest-energy triplet state of zinc tetraphenylporphyrin.767... 

The acyl hypohalit reaction with iodine ob a halogen component is the well-known Prevost reaction,18i0 whioh has found some application during recent years in the field of natural prodwtB.. u. . w. In thiB ease the acyl hypoholite is acetyl hypoiodite, generated by reaction of iodine with silver nitrate in glacial acetic arid (Eq. 130). 

The layered oxide ion conductors Srj Bi9 0(27-.t)/2 and BaBigOis show similar intercalation reactions with iodine. The iodine atoms intercalate into the van der Waals gap between adjacent Bi sheets to form stage 1 compounds. The spacing between adjacent Bi layers increases by 3 A corresponding to the intercalation of a monolayer of iodine atoms. Micro-Raman spectroscopy shows that the intercalated iodine species is predominantly I3. Ag-1 intercalated Sri,5Bi7,50i2.75, was synthesized by reaction with iodine and then in a second step with silver metal. Intercalation of lithium iodide into the ferroelectric layered compound Bi4Ti30i2 j has also been reported. ... 

A similar conversion of olefins to glycols involves reaction with iodine and silver benzoate followed by saponification of the resulting crude di-... 

Electrophilic Addition.—5a -Cholest-2-ene (67), on reaction with iodine, potassium iodate, and sulphuric acid in aqueous dioxan, gave the 2/3,3a-diol (69) as the main product. " The intermediate 2,3-epoxide (68) can be isolated by using a modified procedure, with iodine in aqueous dioxan in the presence of silver oxide to trap liberated hydrogen iodide." The 2-methyl and 3-methyl derivatives of 5a-cholest-... 

Wood et compared cold-deposited films of silver (on copper at 100 K) to bulk-roughened surfaces (by a photochemical reaction with iodine). They found that the enhancement on the former was about 5 times larger than on the latter. They also found that with equal exposures to pyridine the evaporated films exhibited predominantly a first-layer enhancement, while the roughened surface showed comparable signals from the first and subsequent layers. These conclusions strongly depend on the absolute coverages on the surfaces and the relative coverages of the two systems studied, both of which are not known precisely. 

The excess of silver nitrate solution reaction with iodine potasium and a opalescence color of iodine silver indicate the end point of the titration. 

JV-Iodo amides are prepared exclusively by reaction of JV-silver salts with iodine. Occasionally the nitrogen-halogen bond has been created by trans-halogenation from, e.g., dichlorourea396 or JV-bromo amides.397 JV-Chloro-succinimide has been recommended for halogenation of sensitive amines in the steroid series.398... 

The ionization potential of iodine is sufficiently low for it to form a number of compounds in which it is electropositive. It forms I cations, for example, by reaction of solid silver nitrate with iodine solution, and such cations are sufficiently electrophilic to substitute aromatic compounds such as phenol. Iodine also exhibits the interesting property of forming solutions that are violet colored in non-donor type solvents, such as tetrachloromethane, but in donor solvents, such as ethanol or dioxan, there is a strong iodine-solvent interaction, which gives the solution a deep brown color. Even though iodine solutions were commonly used as antiseptic agents, the element is classified as toxic, and care should be taken to avoid eye intrusions or excessive skin contact. 

Pyrazole does not react with iodine although pyrazolylsilver is converted into 4-iodopyrazole. 3-Iodoindazole can be obtained by the reaction of iodine with the silver salt of indazole. Kinetic studies on pyrazole iodination have been carried out by Vaughan et al. (71PMH(4)55, B-76MI40402). Coordination of pyrazole by nickel(II) in aqueous solution increases the rate of iodination by factors of two at pH 6 and eight at pH 7.2 (72JA2460). 

Complex [(CXI )Ir(/j,-pz)(/i,-SBu )(/j,-Ph2PCH2PPh2)Ir(CO)] reacts with iodine to form 202 (X = I) as the typical iridium(II)-iridium(II) symmetrical species [90ICA(178)179]. The terminal iodide ligands can be readily displaced in reactions with silversalts. Thus, 202 (X = I), upon reaction with silver nitrate, produces 202 (X = ONO2). Complex [(OC)Ir(/i,-pz )(/z-SBu )(/i-Ph2PCH2PPh2)Ir(CO)] reacts with mercury dichloride to form 203, traditionally interpreted as the product of oxidative addition to one iridium atom and simultaneous Lewis acid-base interaction with the other. The rhodium /i-pyrazolato derivative is prepared in a similar way. Unexpectedly, the iridium /z-pyrazolato analog in similar conditions produces mercury(I) chloride and forms the dinuclear complex 204. 

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