Nitrites complexes

Replacement of silver nitrite by inexpensive sodiiunor potassium nitrite enhances the imlity of this process Treatment of alkenes v/ith sodiiun nitrite and iodine in ethyl acetate and water in the presence of ethylene glycol gives conjngatednitroalkenesin49-82% yield The method for generation of nitryl iodide is improved by the treatment of iodme v/ith potassium nitrite complexed v/ith 18-crovm-6 in THF under sonicadon, as shovmin Eq 2 32 ... 

Monovalent Nitrile complexes Nitrite complexes Nitrosyl complexes NMR spectra... 

Stability constant measurements have demonstrated the presence of indium(III) nitrite complexes in methanol, and the crystalline compound In(N02)3-Me0H has been isolated.157... 

The labeled nitrite complex may be caused to rearrange by heating. In this process no loss of, 80 is found even in the presence of excess nitrile, confirming AdeU hypothesis that the reaction is an intramolecular rearrangement ... 

Nitrite complexes can be simply prepared by metathetical replacement with nitrite ion.1163 The structure of n-anj-Pt(N02)2 P-(p-tol)3 2 has a Pt—N distance of 2.030(5) A and N—O distances of 1.228(8) A and 1.98(7) A.11 4 Chemical shift (5 Pt) and coupling constant data have been tabulated for a large group of platinum(II) and (IV) nitro complexes. Both chemical shift and coupling constant changes upon ligand substitution are dominated by the nature of the trans ligand/165... 

Nitrite complexes of platinum can be formed, and complexes are known where the N02 ligand is N- or O-bonded. For platinum(II) the compounds are N-bonded, but for platinum(IV) complexes can be synthesized which are O- or N-bonded. Synthetic methods involve substitution reactions with nitrite ion or addition of NO to Pt02(PPh3)2 (equations 477 and... 

Complexes of stoichiometry ZnLX2 (X = N02 or N03) have been isolated from the reaction of zinc nitrite or nitrate with 1,2-dimorpholinoethane and 1,2-dipiperidinoethane.647 The complexes contain zinc in a distorted octahedron of two ligand nitrogens and two bidentate O-bonded nitrite or nitrate anions. The nitrite complexes show greater stability than the... 

Cobalt Nitrite Complexes. When KNOz is added in excess to a soln of Co(NOa)2,acidified with AcOH, a yel ppt of potassium hexa-nitrocobaltiate (potassium cobaltinitrite),... 

Numerous examples of nitrite complexes have been described in Ref. 117. 

Recently several new active site model compounds have been prepared (Carrier et al., 1991) using sterically hindered tris(pyrazoyI)hydroborate (L) and tris(thioethyl)amine (L2) as ligands. The copper nitrite complex LCu11 (N02) models the enzyme substrate complex and X-ray studies confirm that the complex is tetrahedral. A mononuclear copper—nitrosyl complex similar to postulated NO adducts of copper proteins has also been prepared from LCu1 (MeCN) and NO, which has been tentatively identified as a Cu11 -NO species on the basis of IR (v NO 1711 cm 1) and ESR evidence. 

Finally we note that enzymatic reduction of N02 and N03 is important in the natural nitrogen cycle. Copper-containing reductases are known and, as models, copper(I) nitrite complexes with triazacyclononane ligands have been shown to evolve NO.54... 

Interestingly, in the field of transition-metal complex chemistry, examples of O—N bond fission occur in the hydrolysis of nitrite complexes [e.g. as in (42) Klimek et al., 1972]. Tracer studies as well as stereochemical experiments... 

Ni(N03)2] is a common starting material for Ni coordination chemistry, since the lutrato ion is not a very strong donor. However, many nitrate and nitrite complexes are known in which these ligands are bound directly to... 

PdL2L ] adducts are formed by reaction of [PdL4] with small molecules such as NO, SO2, CS2, or O2. [PdL2(02)] species have shown to be active oxidizing agents reacting with CO2, SO2, NO2, or NO to yield carbonate, sulfate, nitrate, and nitrite complexes respectively (equation 5). ... 

NO release takes place in the redox reaction backward to the synthetic procedure induced thermally by UV/visible or even by near infrared (NIR) radiation. There is also a possibility of the gaseous NO release by a hemolytic cleavage of the N—O bond in some nitrite complexes. 

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