Bis- telluride

The reaction of 1,2-diiodoacenaphthene (334) with Na2Te in DMF at room temperature gave the cyclic bis-telluride (335) in 35% yield (equation 198)301. 

There is only one example of a ditelluride dication with bridgehead Te atoms reported in literature. In parallel to the disulfide and diselenide dications discussed earlier, hexafluorophosphate and tetrafluoroborate salts of l,5-ditelluroniabicyclo[3.3.0] octane (58) are prepared from 1,5-ditellurocyclooctane (59) <91TL4537> thus demonstrating the presence of strong transannular interactions between the two Te atoms in the cyclic bis-telluride (Equation (18)). 

Although the PF and BF4 salts of the Te-dication (58) are stable solids, there is as yet no crystallographic data available. In addition to the NMR data given in Table 6 for the dication (58) and the precursor cyclic bis-telluride (59), a phosphorus absorption at S —143.0 (sept, Jpp = 712 Hz relative to H3PO4) is observed in the P NMR of the hexafluorophosphate salt of the dication (58). The drastic downfield shift observed in the Te NMR spectrum (8 1303.7) is consistent with the dication structure <91TL4537>. 

The Te-dication (58) is prepared from 1,5-ditellurocyclooctane (59) using a similar synthetic strategy to those utilized for the syntheses of S- and Se-dications. Two equivalents of nitrosyl hexafluorophosphate or tetrafluoroborate gives the PF or Bp4 salt of the Te-dication (58) as shown in Equation (18). The cyclic bis-telluride (59) is prepared using standard methods (Scheme 16). The Te-dication (58) can also be prepared by the ddq oxidation of the cyclic bis-telluride (59). 

There are no electrophilic aromatic substitution reactions, analogous to those of S-dications or Se-dications, reported in the literature involving the Te-dication (58). As expected, the oxidant properties of the Te-dication are observed in reactions with 1,2-diphenylhydrazine and with benzene thiol where oxidation products, azobenzene and diphenyl disulfide, are obtained respectively. Unlike its S-dication counterpart, the Te-dication does not undergo hydrolysis with water and retains its oxidant properties. NaBH4 reduction converts the Te-dication (58) into the cyclic bis-telluride (59) <91TU537>. 

The catalyst was prepared from a nickel-aluminum (50 50) alloy using the procedure given by Mozingo. The catalyst is used in large excess. Reduced amounts of catalyst resulted in decreased yields, and the product is contaminated with detectable (gas chromatography) amounts of bis(4-methoxyphenyl) telluride. 

Dimethoxybiphenyl can also be prepared by simply refluxing bis(4-methoxyphenyl)tellurium dichloride with degassed commercial Raney nickel. The yields are, however, lower and less reproducible, and the product may contain some bis(4-methoxyphenyl) telluride. 

Bhmingham Metal Company Ltd., 207 Bis(2-chloroisopropyl) ether, 25 Bis(chloromethyl) ether, 25 Bis(chloromethyl) ketone, 25 Bis(2-EthyUiexyl) phthalate, 25 Bismuth and Bismuth Compounds, 25 Bismuth Institute, 256 Bismuth telluride, 26 Bisphenol-A, 26 Bithionol, 26 Bitmac Ltd., 207, 236 Bitoscanate, 26 Bitoumina SA, 167... 

The treatment of LiN(SiMc3)2 with aryl tellurenyl iodides gives stable Ai,iV -bis(trimethylsilyl)tellurenamides that react with acetylenes to give acetylenyl tellurides (Eq. 2.4). 

Disubstituted isotellurazoles 1 (4-11%) and bis((3-acylvinyl)tellurides 3 (3-10%) were isolated in very low yields from the reaction mixture as the products of nucleophilic addition of telluride anion to the triple bond of the initial ethynyl ketones (83S824). This method cannot be applied to the synthesis of 3//-isotellurazoles. When a-acetylenic aldehydes were used instead of ethynyl ketones, bis((3-cyanovinyl)tellurides 4 obtained in 14-20% yields were the only products (83S824). 

Molecular and crystal structures of the macroheterocycle 102 were studied by X-ray [96JCS(D)1203]. As for bis-imines of di(o-formylphenyl) telluride 106, [89MI1 91JOM(402)331] only one of two potentially possible intramolecular coordination N Te bonds exists in a molecule of the macrocycle 102, which, in... 

Ethyleneimine reacts with (p-tolylsulfonyl)acetylene to give only the (Z)-product 115 via trans addition (equation 91), while primary and secondary aliphatic amines afford ( )-products76. With nonterminal acetylenes such as l-(ethylsulfonyl)-l-propyne, the reactions of ethyleneimine, n-propylamine and f-butylamine give mixtures of ( )- and (Z)-adducts. The double conjugate addition of sodium sulfide, selenide and telluride to bis(l-propynyl)sulfone (116) produces heterocycles (117) as illustrated in equation 9277. 

Bi2Se3 bismuth selenide, BiSe bismuth(III) sulfide, Bi2S3 (bismuthinite) bis-muth(III) telluride, Bi2Tc3 (tellurobismuthite) bismuth telluride, BiTe. 

Cathodic deposition of bismuth(in) telluride films has been reported [224] also on copper and nickel foils, from aqueous nitric acid solutions of bismuth oxide and tellurium oxide in molar ratios of Bi Te = 3 3 and 4 3, at 298 K. The... 

The ECALE synthesis of V-VI (V Sb, Bi) compounds has been attempted in a few works. Antimony telluride, Sb2Te3, nanofilms with a homogeneous microstructure and an average size of about 20 nm were formed epitaxially on a Pt substrate [61]. The optical band gap of these films was blue-shifted in comparison with that of the bulk single-crystal Sb2Tc3 compound. 

TMEDA can also participate in the formation of multinuclear zinc telluride complexes with Znio, Zni4, and Zni6 complexes structurally characterized. A comparison was carried out by Pfistner et al. replacing the diamine with a diphosphorus ligand, bis(diphenylphosphino)methane,... 

Bis(stannyl) tellurides yield aryl stannyl sulphides, as shown in reaction 33287. 

Fig. 11 Plausible mechanism for the debromination of organic substrates with bis(tri-phenylstannyl) telluride.

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