- Germane vs. digermane formation
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Oxidative addition reactions of dialkylchalcogenanes R2E2 and [Me2Si(Nt-Bu)2]Ge 1 yielded bis(alkylchalcogeno)germanes Me2Si(Nt-Bu)2Ge(ER)2 (R = Et, E = S 2, Se 3; R = Me, E = Se
- Steiniger,Bendt,Bl?ser,W?lper,Schulz
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supporting information
p. 15461 - 15463
(2015/02/19)
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- Reaction of 1,1-dichloroethane with tellurium in the system hydrazine hydrate-potassium hydroxide
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The reaction of 1,1-dichloroethane with tellurium in the system hydrazine hydrate-potassium hydroxide gave ethyltellanyl derivatives as a result of replacement of one chlorine atom in the substrate by tellurium, and of the other, by hydrogen. Probable mechanisms of reduction of the C-Cl bond and mass spectra of the products were considered. The mass spectra of ditelluroacetals revealed unusual rearrangement of the molecular ion, leading to the formation of Te-Te and new C-C bond.
- Levanova,Grabel'nykh,Kolesnikov,Klyba,Zhanchipova,Albanov,Russavskaya,Korchevin
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experimental part
p. 988 - 992
(2011/02/26)
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- Reaction of tellurium with dichloromethane in the system hydrazine hydrate-alkali
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Tellurium reacts with dichloromethane in the system hydrazine hydrate-alkali substituting one chlorine atom by tellurium whereas the second chlorine atom undergoes reductive substitution by hydrogen leading to the formation of methyltellanyl derivatives.
- Levanova,Grabel'Nykh,Russavskaya,Klyba,Albanov,Korchevin
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experimental part
p. 2321 - 2327
(2010/05/15)
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- Process for the preparation of group IVA and group VIA compounds
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Methods of preparing Group IVA and Group VIA organometallic compounds, particularly Group IVA organometallic compounds, are provided. Such manufacturing methods employ an amine and/or phosphine catalyst in a transalkylation step and may be performed in a batch, semi-continuous or continuous manner.
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- Reaction of Mono- and Dihaloalkanes with Mixed Solutions of Chalcogens in Alkaline Reductive Systems
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Sufur-selenium, sulfur-tellurium, selenium-tellurium, and sulfur-selenium-tellurium mixtures readily dissolve in the hydrazine hydrate-alkali system to form chalcogenide anions. Alkylation of the latter with ethyl bromide results in preferential formation
- Deryagina,Grabel'nykh,Mamaseva
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p. 711 - 714
(2007/10/03)
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- N,N′-bis(3-triethylsilylpropyl)thiourea S-dioxide and poly[N,N′-bis(silsesquioxanylpropyl)thiourea S-dioxide] as reductants
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The reducing power of organosilicon thiourea S-dioxides, N,N′-bis(3triethylsilylpropyl)thiourea S-dioxide and poly[N,N′ -bis(silsesquioxanylpropyl)thiourea S-dioxide], was studied. The first, monomeric dioxide readily reduces cyclohexanone to cyclohexanol. In its presence, under phase-transfer conditions, dipropyl disulfide reacts with bromobenzene to form propyl phenyl sulfide, and tellurium reacts with ethyl bromide to form diethyl telluride. The reducing power of the polymeric dioxide was demonstrated by the example of reduction of potassium permanganate. Irrespective of the medium (neutral, acidic, or alkaline), this polymer reduces Mn(VII) to Mn(IV).
- Vlasova,Raspopina,Pozhidaev,Voronkov
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- NEW ROUTE TO ORGANIC SELENIDES AND TELLURIDES
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A new simple and convenient synthetic route to organic chalcogenides R2Y (R = alkyl, allyl, benzyl; Y = Se, Te) is developed, which involves generation of Se2- and Te2- anions from Se and Te in the system KOH-hydrazine hydrate, where the latter plays the role of both the medium and reducing agent.Subsequent alkylation of the anions with the corresponding alkyl halides furnishes the target chalcogenides in almost 95percent yield.Alkyl chlorides react faster than alkyl bromides and alkyl iodides.
- Korchevin, N. A.,Podkuiko, P. A.,Stankevich, V. K.,Deryagina, E. N.,Trofimov, B. A.
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- Synthesis of alkali metal tellurides and ditellurides in THF and their relative reactivities towards alkyl bromides: A convenient synthesis of dialkyl tellurides and dialkyl ditellurides
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Lithium, sodium and potassium reduce smoothly elemental tellurium to telluride (Te2-) and ditelluride (Te22-) anions in the tetrahydrofuran, THF, medium in the presence of catalytic amounts of naphthalene.The relative reactivities of these alkali metal tellurides towards alkyl bromides have been investigated and a number of dialkyl tellurides and dialkyl ditellurides prepared in good to excellent yields.The compounds prepared are characterised by elemental analysis, 1H NMR and mass spectral studies.
- Bhasin, K K,Gupta, Vijay,Sharma, R P
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p. 632 - 634
(2007/10/02)
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- A New Route for the Synthesis of Dialkyl Tellurides and Dialkyl Ditellurides
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Sodium cleaves elemental tellurium, Tex, quantitatively to Te2-2 and Te2- in anhydrous tetrahydrofuran in the presence of catalytic amounts of naphthalene.Subsequent addition of alkylating agent affords dialkyl tellurides and dialkyl ditellurides in excellent yields.
- Bhasin, K.K.,Gupta, Vijay,Gautam, A.,Sharma, R.P.
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p. 2191 - 2195
(2007/10/02)
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- ALKYLVINYL TELLURIDES FROM TELLURIUM, ACETYLENE AND ALKYL HALIDES
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Synthetic routes to alkylvinyl tellurides by direct reaction of metallic tellurium, acetylene and alkyl halide in the system KOH-SnCl2-H2O and successive interaction of divinyl telluride with lithium and alkyl halide in liquid ammonia have been developed.
- Trofimov, B. A.,Gusarova, N. K.,Tatarinova, A. A.,Potapov, V. A.,Sinegovskaya, L. M.,et. al.
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p. 6739 - 6744
(2007/10/02)
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- REACTIONS OF CHALCOGENS WITH ACETYLENES. ALKYL VINYL TELLURIDES FROM TELLURIUM, ACETYLENE, AND ALKYL HALIDES
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Methods were developed for the synthesis of alkyl vinyl tellurides from metallic tellurium, acetylene, and alkyl halides in the KOH-SnCl2-H2O system and also by the successive action of lithium and alkyl halide on divinyl telluride in liquid ammonia.
- Gusarova, N. K.,Trofimov, B. A.,Tatarinova, A. A.,Potapov, V. A.,Sinegovskaya, L. M.,at al.
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p. 1686 - 1691
(2007/10/02)
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- DIE REAKTIONEN VON BIS(PERFLUORORGANO)TELLUR-VERBINDUNGEN (Rf)2Te (Rf=CF3, C6F5) MIT DIALKYLCADMIUM- UND -ZINK-VERBINDUNGEN R2M (R=CH3, C2H5; M=Zn, Cd)
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In the presence of diglyme bis(perfluoroorgano)tellurium-compounds (Rf)2Te (Rf=CF3, C6F5)) react with (CH3)2M (M=Zn, Cd) by stepwise Rf/R-exchange via CH3TeRf and CH3MRf to form (CH3)2Te and (Rf)2M*diglyme.A stoichiometric excess of (Rf)2Te favours the formation of CH3TeRf and (Rf)2M*diglyme; equimolar amounts react to (CH3)2Te and (Rf)2M*diglyme and an excess of (CH3)2M gives (CH3)2Te along with CH3MRf*diglyme.CF3TeCF3 is isolated in good yield by reacting (CH3)2M with (CF3)2Te in the ratio 1:2. (CF3)2Te also reacts with (C2H5)2M in the presence of diglyme to yield (CF3)2M*diglyme and C2H5)2Te.
- Herberg, S.,Lange, H.,Naumann, D.
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p. 267 - 274
(2007/10/02)
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- A CONVENIENT METHOD FOR THE PREPARATION OF DIALKYL TELLURIDE
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Treatment of various alkyl halides with sodium telluride which is generated by reduction of elemental tellurium with hydrazine hydrate in basic medium using DMF as aprotic solvent affords the corresponding symmetric dialkyl tellurides in moderate to good yields.
- Lue, Pin,Chen, Bang-chi,Yu, Xu-wei,Chen, Jian,Zhou, Xun-jun
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p. 1849 - 1854
(2007/10/02)
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