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Iodine azide

Aluminum methyl Iodine azide Radio isotopes, gamma emitters... [Pg.1026]

Iodine azide, on the other hand, forms pure adducts with A -, A - and A -steroids by a mechanism analogous to that proposed for iodine isocyanate additions. Reduction of such adducts can lead to aziridines. However, most reducing agents effect elimination of the elements of iodine azide from the /mwj -diaxial adducts of the A - and A -olefins rather than reduction of the azide function to the iodo amine. Thus, this sequence appears to be of little value for the synthesis of A-, B- or C-ring aziridines. It is worthy to note that based on experience with nonsteroidal systems the application of electrophilic reducing agents such as diborane or lithium aluminum hydride-aluminum chloride may yet prove effective for the desired reduction. Lithium aluminum hydride accomplishes aziridine formation from the A -adducts, Le., 16 -azido-17a-iodoandrostanes (97) in a one-step reaction. The scope of this addition has been considerably enhanced by the recent... [Pg.24]

Iodine azide is a highly selective reagent addition to the 16-double bond of androsta-4,16-diene-3-ones is possible and some selectivity in addition to the 16-double bond of A -dienes has been observed.Hydroxy groups in the steroid should be protected, e.g., by acetylation, since in some instances oxidized side products are formed. [Pg.24]

Interniolecular hydrogen abstraction, 239 Intramolecular free radical reactions, 238 Intramolecular hydrogen abstraction, 239 Iodine azide, 24... [Pg.461]

The disulfide has a special interest as the catalyst in the carbon disulfide-catalyzed iodine-azide reaction. No perceptible nitrogen evolution will take place in a solution containing iodine and azide ions without the presence of a catalyst. Thiosulfates, sulfides, and many other sulfur compounds act as catalysts. In 1922 Browne et found that carbon disulfide is a powerful catalyst in this... [Pg.274]

N. Hofman-Bang, The Iodine-Azide Reaction. C. A. Reitzels Forlag, Copenhagen, 1952. [Pg.274]

According to Hofman-Bang carbon sulfide selenide, CSSe, catalyzes the iodine-azide reaction but is at the same time decomposed with the formation of selenium. Experiments, in both this laboratory and that of Hofman-Bang have shown that carbon diselenide reacts with sodium azide (in aqueous or aqueous-alcoholic solution) with immediate precipitation of red selenium even at — 20° C. //a selena-triazole is formed in this reaction it must be extremely unstable. [Pg.275]

Triazojodid, n. triazoiodide (iodine azide, Nsl) tribasisch, a. tribasic. [Pg.451]

Iodine azide, 1N3, adds to alkenes by an electrophilic mechanism similar to that of bromine. If a monosubstituted alkene such as 1-butene is used, only one product results ... [Pg.254]

Iodine azide, generated in situ from an excess of sodium azide and iodine monochloride in acetonitrile, adds to ethyl l//-azepine-l-carboxylate at the C4 — C5 and C2 —C3 positions to yield a 10 1 mixture of the rw-diazidodihydro-l//-azepines 1 and 2, respectively.278 The as stereochemistry of the products is thought to be the result of initial trans addition of the iodine azide followed by an SN2 azido-deiodination. The diazides were isolated and their stereochemistry determined by conversion to their bis-l,3-dipolar cycloadducts with dimethyl acetylene-dicarboxylate. [Pg.197]

The detection depends on the iodine azide reaction that normally takes place very slowly and during the course of which sodium azide reacts with iodine to form sodium iodide with the production of nitrogen ... [Pg.159]

However, the starch solution should not be omitted completely since the color difference between the chromatogram zones, in which the iodine is reduced to colorless iodide according to the iodine azide reaction mentioned above, and the background colored brown by unreacted iodine is considerably less than the difference in color between the deep blue background provided by the starch-iodine clathrate complex and the pale chromatogram zones. [Pg.159]

Ridomil, with which the treatment with starch solution was not carried out, is said to yield brown chromatogram zones on a pale yellow background [14]. Hence, it may be assumed that this detection is based not on the iodine azide reaction but on the physical adsorption and enrichment of iodine in the lipophilic chromatogram zones (cf. Iodine Reagents ). [Pg.159]

Insulin derivatives lb 401 lodate anions la 188,190 lb 307 Iodine staining lb 278 Iodine-azide reaction lb 85,301-304 Iodide anions la 190 lb 76,77,128,129 Iodide vapor la 46,64,78 lodination la 66... [Pg.488]

Puacz et al. (1995) developed a catalytic method, based on the iodine-azide reaction, for the determination of hydrogen sulfide in human whole blood. The method involves the generation of hydrogen sulfide in an evolution-absorption apparatus. In addition, the method allows for the determination of sulfide in blood without interference from other sulfur compounds in blood. A detection limit of 4 g/dm3 and a percent recovery of 98-102% were achieved. Although the accuracy and precision of the catalytic method are comparable to those of the ion-selective electrode method, the catalytic method is simpler, faster, and would be advantageous in serial analysis. [Pg.152]

Silver azide, itself a sensitive compound, is converted by ethereal iodine into the less stable and explosive compound, iodine azide. Similarly, contact with nitrogen-diluted bromine vapour gives bromine azide, often causing explosions. [Pg.20]

The isolated solid is a very shock- and friction-sensitive explosive [1], but the preparation and safe handling of dilute solutions in solvents other than ether have been described [2], The need to use appropriate techniques and precautions when using iodine azide as a reagent is stressed [3], The purer the more explosive explosive properties are characterised (lead-block test, etc.) in a footnote to [4],... [Pg.1713]


See other pages where Iodine azide is mentioned: [Pg.83]    [Pg.84]    [Pg.87]    [Pg.474]    [Pg.82]    [Pg.22]    [Pg.25]    [Pg.824]    [Pg.263]    [Pg.274]    [Pg.282]    [Pg.230]    [Pg.311]    [Pg.15]    [Pg.1046]    [Pg.50]    [Pg.158]    [Pg.49]    [Pg.477]    [Pg.785]    [Pg.893]    [Pg.328]    [Pg.474]    [Pg.335]    [Pg.1713]   
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Azidation Using Hypervalent Iodine Compounds

Azidation iodine derivatives

Azidations. using hypervalent iodine reagents

Hydrazines iodine azide

Iodination reagents iodine azide, addition

Iodine Azide or Iodoazide

Iodine Azide or lodoazide

Iodine azide Subject

Iodine azide addition

Iodine azide addition reactions

Iodine azide alkenes

Iodine azide aziridine synthesis

Iodine azide azirine synthesis

Iodine azide reactions with allenes

Iodine azide, as reagent

Iodine azide, electrophilic additions

Iodine azide, reactions with unsaturated

Iodine-azide reaction

Iodine-azide reagent

Orantine, O-methylsynthesis via iodine azide addition to alkene

Reaction with iodine azide

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