- Hydrozirconation of acetylenic chalcogenides. Synthesis and reactions of zirconated vinyl chalcogenide intermediates
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Acetylenic tellurides react with Cp2Zr(H)Cl in THF at room temperature to give the α-zirconated vinyl telluride intermediates 39, which react with a wide range of electrophiles to give several types of trisubstituted olefins, such as α-halo vin
- Dabdoub, Miguel J.,Begnini, Mauro L.,Guerrero Jr., Palimecio G.
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p. 2371 - 2400
(2007/10/03)
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- REACTIONS OF CHALCOGENS WITH ACETYLENES. VI. REACTIONS OF CHALCOGENS WITH PHENYLACETYLENE AND ALKYL HALIDES
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A method was developed for the production of alkyl phenylethynyl selenide with yields of up to 70percent on the basis of an investigation into the reaction of chalcogens with phenylacetylene and alkyl halides in the superbasic potassium hydroxide-hexamethylphosphorotriamide system.
- Potapov, V. A.,Amosova, S. V.,Kashik, A. S.,Gusarova, N. K.,Trofimov, B. A.
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p. 2057 - 2062
(2007/10/02)
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- LITHIUM ORGANYL-POLYCHALCOGENOLATES
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Lithium organyl-selenolates, RSeLi or tellurolates, RTeLi insert further equivalents of chalcogens with formation of selenyl-selenolates, RSeSeLi or tellurenyl-tellurolates, RTeTeLi (R=Me, n-Bu, s-Bu, t-Bu, Ph).Mixed anions are only formed if the chalcogen insertion order corresponds with an increase of electronegativity, i.e.: RTeSeLi, RTeSLi, RSeSLi and n-BuTeSeSLi.All species have been characterized by 77-Se and 125-Te NMR-spectroscopy.Tellurenyl-tellurolates and tellurenyl-selenolates are stable at room temperature, selenyl-selenolates and chalcogenyl-thiolatesdisproportionate.The chemical integrity of the chalcogenyl-chalcogenolates was checked by methylation with methyl triflate.The formed organyl-methyl-dichalcogenides exhibit symmetrization equilibria that are also obtained by mixing the symmetric conpounds.Oxidation of tellurenyl-selenolates affords di(organyl-tellurenyl) selenides, (RTe)2Se (R=Me, n-Bu, t-Bu, Ph, p-MeC6H4, 2-thienyl) and (RTe)2Se2 for R=(Me3Si)3C.In solution (RTe)2Se are in equilibrium with R2Te2 and (RTe)2Se2.
- Koellemann, Christoph,Obendorf, Dagmar,Sladky, Fritz
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