- Gif-type oxidation systems. Evidence for a second intermediate between saturated hydrocarbon and ketone
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The addition of dianisyl telluride to a Gif(IV) oxidation of adamantane has a marked effect on the ratio of ketone to secondary alcohol formed. This is interpreted as an indication of a second intermediate in the conversion of saturated hydrocarbvons into ketones. This second intermediate is probably an Fe(III) alkoxide.
- Barton,Csuhai,Ozbalik
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Read Online
- The Anticancer Activity of Organotelluranes: Potential Role in Integrin Inactivation
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Organic TeIV compounds (organotelluranes) differing in their labile ligands exhibited anti-integrin activities in vitro and anti-metastatic properties in vivo. They underwent ligand substitution with l-cysteine, as a thiol model compound. Unlike inorganic TeIV compounds, the organotelluranes did not form a stable complex with cysteine, but rather immediately oxidized it. The organotelluranes inhibited integrin functions, such as adhesion, migration, and metalloproteinase secretion mediation in B16F10 murine melanoma cells. In comparison, a reduced derivative with no labile ligand inhibited adhesion of B16F10 cells to a significantly lower extent, thus pointing to the importance of the labile ligands of the TeIV atom. One of the organotelluranes inhibited circulating cancer cells in vivo, possibly by integrin inhibition. Our results extend the current knowledge on the reactivity and mechanism of organotelluranes with different labile ligands and highlight their clinical potential.
- Silberman, Alon,Kalechman, Yona,Hirsch, Shira,Erlich, Ziv,Sredni, Benjamin,Albeck, Amnon
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p. 918 - 927
(2016/05/24)
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- The highly selective metal-free oxidation of sulfides, tellurides and phosphines using sodium bromate in the presence of recyclable ionic liquid [bmim]HSO4, at 80°C
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The metal-free oxidation of sulfides to sulfones using sodium bromate (NaBrO3) in [bmim]HSO4:H2O (3:1, v/v) at 80°C is reported. Phenylalkyl, phenylbenzyl, diaryl and heteroaryl sulfides were transformed to the corresponding sulfones. Aryl tellurides and phosphines were oxidised to the corresponding telluroxides and phosphine oxides. All the reactions proceeded smoothly and gave high yields in 20-55 min. The ionic liquid [bmim]HSO4 was easily recovered and recycled.
- Rajeswari,Lumb, Anshika,Khurana, Jitender M.
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p. 442 - 444
(2016/07/21)
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- Aerobic oxidation of thiols to disulfides catalyzed by diaryl tellurides under photosensitized conditions
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Aerobic oxidation of thiols is efficiently catalyzed by diaryl tellurides such as bis(4-methoxyphenyl) telluride under photosensitized conditions to give the corresponding disulfides in good to excellent yields. In this catalytic system, the tellurone oligomer, produced by the reaction of a telluride with singlet oxygen, is assumed to be the active species and is capable of oxidizing 4 equiv of a thiol.
- Oba, Makoto,Tanaka, Kazuhito,Nishiyama, Kozaburo,Ando, Wataru
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scheme or table
p. 4173 - 4177
(2011/06/26)
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- Aqueous sodium hypochlorite mediated chemoselective oxidation of chalcogenides to monoxides and dioxides by microwave exposure
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A solvent-free, rapid, and highly selective oxidation of sulfides, selenides, and tellurides (chalcogenides) to the corresponding monoxides (sulfoxides, selenoxides, and telluroxides) or the corresponding dioxides (sulfones, selenones, and tellurones) has been developed using aqueous sodium hypochlorite on solid supports by exposure to microwave. Chemoselectivity and quantitative yields have been attained in most cases.
- Khurana, Jitender,Nand, Bhaskara
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experimental part
p. 906 - 909
(2011/01/08)
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- Photosensitized oxygenation of diaryl tellurides to telluroxides and their oxidizing properties
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Photosensitized oxidation of tellurides carrying bulky aromatic substituents afforded the corresponding telluroxides which were found to react with simple alcohols to give the corresponding carbonyl compounds in excellent yields along with the starting tellurides.
- Oba, Makoto,Endo, Masaki,Nishiyama, Kozaburo,Ouchi, Akihiko,Ando, Wataru
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p. 1672 - 1673
(2007/10/03)
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- Diorganotellurium(IV) bis(fluorocarboxylates)
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Diorganotellurium(IV) bis(fluorocarboxylates) have been prepared by the interaction of R2Te(OMe)2 with fluorocarboxylic acids (R'COOH).Identical products were obtained by the metathetical reaction of R2TeCl2 with silver salts of the fluorocarboxylic acids in 1 : 2 molar ratios.However, when the reaction proceeded in a 1 : 1 molar ratio, the product was R2TeCl(OCOR').However, reaction of R2TeO with CF3COOH yielded 2*H2O> and species.The products are non-conducting and monomeric in solution.The mode of bonding of the fluorocarboxylate group and a possible geometry around the central tellurium atom are suggested on the basis of physicochemical and spectral (IR, mass, 1H, 13C, 19F and 125Te NMR) studies.
- Srivastava, Sanjay Kumar,Srivastava, T. N.,Singh, Jai Deo,Srivastava, Arun K.,Kumar, P.
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p. 103 - 108
(2007/10/03)
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- SYNTHESIS, STRUCTURE, AND PROPERTIES OF COMPOUNDS WITH A CHALOGEN-NITROGEN-BOND. XII. SYNTHESIS OF N-SULFONYLTELLURIMIDES BY THE REACTION OF TELLURIDES WITH SODIUM SALTS OF N-CHLOROSULFONAMIDES
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Two methods are developed for the production of N-sulfonyldiaryltellurimides based on the reaction of tellurides with chloramines B and T.Unlike diaryl tellurides, aryl methyl tellurides give stable monohydrates of the tellurimides in this reaction.
- Naddaka, V. I.,Avanesyan, K. V.,Cherkinskaya, M. L.
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p. 328 - 332
(2007/10/02)
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- Indirect Electrolytic Oxidation of Thioamides Using Organotellurium as a Mediator
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Bis(p-methoxyphenyl) telluride (1) electrochemically reacted with supporting electrolytes such as tetrabutylammonium acetate and tetraethylammonium tosylate under anhydrous conditions to give tellurium(IV) diacetate 2a and ditosylate 2b, respectively.On the other hand, 1 was electrolyzed in the presence of water to give telluroxide 3.It has turned out that the tellurium compounds 2a and 2b like telluroxide 3 are mild oxidizing agents, but 2b behaves differently in a reaction towards thioamide.Thus 2a and 3 converted it into nitrile, while 2b did it into 1,2,4-thiadiazole.An indirect electrolytic oxidation of thioamides with 1 as a mediator was examined under various conditions.As a result, nitriles or 1,2,4-thidiazoles could be chemoselectively formed, depending on the intermediacy of 2a or 3 as an active species for the formed and 2b for the latter.
- Matsuki, Toshiaki,Hu, Nan Xing,Aso, Yoshio,Otsubo, Tetsuo,Ogura, Fumio
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p. 2117 - 2122
(2007/10/02)
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- Some Diorganotellurium(IV) Bis(salicylaldehydo) Complexes
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Diorganitellurium(IV) bis(salicylaldehydo) complexes, (R = C6H5, CH3, p-CH3OC6H4 and biphenylene) have been prepared by the interaction of organotellurium(IV) methoxide with salicylaldehyde.The complexes react with haloacetic acids (R'COOH
- Srivastava, T. N.,Singh, Jai Deo,Mehrotra, Shashi
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p. 480 - 481
(2007/10/02)
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- Oxidation process using tellurium oxide catalysts
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The present invention relates to the use of telluroxides as mild and selective oxidizing agents serving to oxidize certain functions, notably >C=S groups, in the presence of other relatively easily oxidized functions which remain unaffected; telluroxides of interest as oxidizing agents include, for example, compounds of the formula: STR1 wherein R and R1, which may be the same or different, each represent an optionally substituted aryl or heterocyclic group; or R and R1 together with the tellurium atom therebetween represent a heterocyclic ring, which may contain one or more further heteroatoms, and which may carry substituents and/or fused aromatic rings.
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- SYNTHESIS, STRUCTURE, AND PROPERTIES OF COMPOUNDS WITH A CHALCOGEN-NITROGEN BOND. II. DIARYL-N-BENZYLSULFONYLTELLURIMIDES
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The IR, UV, and PMR spectra of a series of diaryl-N-benzylsulfonyltellurimides were investigated.These compounds are bipolar and have a considerable positive charge on the tellurium atom.
- Naddaka, V. I.,Gar'kin, V. P.,Maksimenko, A. A.,Sadekov, I. B.
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p. 2210 - 2216
(2007/10/02)
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