- Reactions of 1,2-dihaloethanes with chalcogenide anions
-
Reactions of 1,2-dihaloethanes with chalcogenide anions generated from elemental chalcogens and dimethylchalcogens were performed in the hydrazine hydrate-KOH system. The use of anions Se x 2- and Te x 2- (x = 1-4) resulted in ethylene evolution and chalcogen regeneration (or in increased x value in an anion). Oligomers of Thiokol type formed only in the reaction of the 1,2-dichloroethane with a mixture of potassium disulfide and diselenide. The reductive cleavage of oligomers obtained in the hydrazine hydrate-KOH system followed by methylation led to the formation of 1,2-bis(methylthio)ethane, 1-methylseleno-2- methylthioethane, and 1,2-bis(methylseleno)ethane. The features of substitution with chalcogenide anions in vicinal dihalides are discussed. Mass spectra of compounds obtained were measured and analyzed. Pleiades Publishing, Inc. 2006.
- Russavskaya,Grabel'nykh,Levanova,Sukhomazova,Klyba,Zhanchipova,Tatarinova,Elaev,Deryagina,Korchevin,Trofimov
-
-
Read Online
- A Novel O-Alkyl Cleavage of Carboxylic Esters Effected by Tellurium Reagents
-
A new method for producing sodium telluride, sodium hydrogen telluride, and sodium ditelluride from tellurium and sodium borohydride in dimethylformamide is devised.These sodium telluride reagents dealkylate methyl, benzyl, and ethyl carboxylates selectively.
- Chen, Jian,Zhou, Xun Jun
-
-
Read Online
- Reaction of 1,1-dichloroethane with tellurium in the system hydrazine hydrate-potassium hydroxide
-
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
-
experimental part
p. 988 - 992
(2011/02/26)
-
- Reactions of dichloromethane with chalcogens and dimethyl chalcogenides in the hydrazine hydrate-alkali system
-
Methods of synthesis of compounds MeY(CH2Y) n Me (Y=S, Se, Te; n = 1-3) containing several identical or different chalcogen atoms are suggested. The methods are based on the reactions of dichloromethane with elemental chalcogens (Ys
- Levanova,Vshivtsev,Sukhomazova,Grabel'nykh,Russavskaya,Zhanchipova,Klyba,Albanov,Korchevin
-
experimental part
p. 1734 - 1741
(2009/02/07)
-
- Process for the preparation of group IVA and group VIA compounds
-
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.
- -
-
-
- NEW ROUTE TO ORGANIC SELENIDES AND TELLURIDES
-
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.
-
-
- Preparation of dialkyl tellurium and dialkyl selenium
-
Dialkyl SE and TE compounds are prepared by reacting a Na chalcogenide with a alkyl halide in a two-phase system of solvents.
- -
-
-
- SYNTHESIS OF ACETYLENIC TELLURIDES BY THE IODOMETHANE-INDUCED REACTION OF DIALKYL DITELLURIDES WITH PHENYLACETYLENE
-
Interaction of dialkyl ditellurides with phenylacetylene under phase transfer conditions occurs only in the presence of iodomethane giving rise to alkyl phenylethynyl tellurides in high yield.These compounds can also be obtained from alkyltellurenyl iodides and phenylacetylene under the same conditions.Keywords: Alkyl phenylethynyl tellurides, dialkyl ditellurides, iodomethane, phenylacetylene, alkyltellurenyl iodides.
- Potapov, Vladimir A.,Amosova, Svetlana V.,Khangurov, Aleksandr V.,Petrov, Pavel A.
-
p. 273 - 276
(2007/10/02)
-
- Homolytic reactions of diorganotellurium and diorganoditellurium compounds in solution; an EPR study
-
The thermal and photochemical decompositions of dialkyltelluriums and dialkylditelluriums in t-butylbenzene solvent have been studied by EPR spectroscopy.On photolysis, di-t-butyl, diallyl, allyl methyl, and dibenzyl tellurium showed EPR spectra of t-butyl, allyl, allyl, and benzyl radicals respectively.Alkyl radicals were not detected directly on thermolysis in the range 300-370 K but, primary, secondary, and tertiary alkyl, benzyl and allyl telluriums gave spin adducts of the corresponding alkyl radical with nitrosodurene.Dimethyl tellurium was unreactive in the same temperature range.The rates of thermal decomposition of the diorgano telluriums at 315 K were found to be in the following order, as judged by the intensity of the spin adduct spectra: tBu2Te ca. tBuTeMe > (allyl)2Te ca. allylTeMe > sBu2Te > (benzyl)2Te > iPr2Te > Et2Te > Me2Te.For dihex-5-ethyltellurium the results were consistent with formation and cyclisation of hex-5-enyl and hex-5-enetelluryl radicals.In the case of dipent-4-enyltellurium, the results suggested that both exo- and endo-cyclisation of the pentene telluryl radicals were important.Di-isopropyl- and di-t-butyl-ditelluriums gave spin adducts of the corresponding alkyl radicals on therolysis in the same temperature range as the monoalkyltelluriums.
- Bell, William,Cole-Hamilton, David J.,Culshaw, Peter N.,McQueen, A. Ewan D.,Shenai-Khatkhate, D. V.,et al.
-
-
- Method for preparation of dialkyl tellurium and dialkyl selenium
-
Tellurium and selenium dialkyls are prepared by reacting the corresponding tetrahalide with a Group I metal alkyl.
- -
-
-
- ALKYLVINYL TELLURIDES FROM TELLURIUM, ACETYLENE AND ALKYL HALIDES
-
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.
-
p. 6739 - 6744
(2007/10/02)
-
- REACTIONS OF CHALCOGENS WITH ACETYLENES. ALKYL VINYL TELLURIDES FROM TELLURIUM, ACETYLENE, AND ALKYL HALIDES
-
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.
-
p. 1686 - 1691
(2007/10/02)
-
- DIE REAKTIONEN VON BIS(PERFLUORORGANO)TELLUR-VERBINDUNGEN (Rf)2Te (Rf=CF3, C6F5) MIT DIALKYLCADMIUM- UND -ZINK-VERBINDUNGEN R2M (R=CH3, C2H5; M=Zn, Cd)
-
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.
-
p. 267 - 274
(2007/10/02)
-
- TELLUROPHOSPHONIUM-KATIONEN
-
Tellurophosphoranes R3P=Te (R = CH3, i-C3H7, n-C4H9, t-C4H9, N(CH3)2) 1 react with CH3I to give the cations + 2.Te(CH3)2 and R3P are formed on treatment of 2 with LiCH3.
- Kuhn, Norbert,Schumann, Hans
-
p. 199 - 202
(2007/10/02)
-
- EIN EINFACHES VERFAHREN ZUR SYNTHESE VON I UND EMe2 (E = Se, Te)
-
Treatment of MeELi (E = Se, Te) with excess methyl iodide gives EMe3+ cations which are dealkylated by phosphanes PR3 (R = n-C4H9, C6H5) to give the dimethyl chalcogenides ER2 in good yields.
- Kuhn, N.,Faupel, P.,Zauder, E.
-
-
- (CF3)2Cd*D UND (CF3)2Zn*D: NEUE REAGENZIEN FUER DIFLUORCARBEN-REAKTIONEN
-
During the thermal decomposition of (CF3)2Cd and (CF3)2Zn complexes primarily difluorocarbene is eliminated.The formation of CF2 is unambiguously proved by matrix i.r. spectroscopy.Both (CF3)2Cd*D and (CF3)2Zn*D are excellent CF2 sources, which can easily be prepared and handled, and which undergo CF2 reactions even at low temperature.CF2 insertion was found during the reaction of (CF3)2Te with (CH3)2Cd via the intermediate formation of a CF3Cd compound to form CH3TeCF2CH3. (CF3)2Cd*glyme reacts with (CH3)3Si(OCOCF3) to CF3Cd(OCOCF3)*glyme; during this reaction CF2 is also eliminated.
- Lange, Horst,Naumann, Dieter
-
p. 299 - 308
(2007/10/02)
-
- DIALKYLTELLURONIUM ALLYLIDE AS A NOVEL REAGENT FOR SYNTHESIS OF Α,Β-UNSATURATED EPOXIDES
-
Reaction of dialkyltelluronium allylide with aldehydes gave rise to α,β-unsatirated epoxides with moderate Z-selectivity and in good yields.
- Osuka, Atsuhiro,Suzuki, Hitomi
-
p. 5109 - 5112
(2007/10/02)
-