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8 results on '"Hasan Tashtoush"'

2. Free‐Radical Coupling of Alkyl and Aryl Halides with Electron‐Deficient Alkenes Mediated by Chromium(II) Complexes [1]

Author

Hasan Tashtoush and Reiner Sustmann

Subjects
chemistry.chemical_classification, Aryl, Radical, Halide, Free-radical reaction, chemistry.chemical_element, Ethylenediamine, Photochemistry, Coupling reaction, Inorganic Chemistry, chemistry.chemical_compound, Chromium, chemistry, Polymer chemistry, Alkyl
Abstract

Free radicals generated from organic halides and (ethylenediamine)chromium(II) complexes in DMF are trapped by electron-deficient olefins. The coupling reactions of alkyl halides, described in Part I[1], are extended and, in addition, aryl halides are shown to be efficient radical precursors to yield coupling products in good yield.

Published
1993

3. Chromium(II)‐Mediated Intermolecular Free‐Radical Carbon — Carbon Bond Formation

Author

Hasan Tashtoush and Reiner Sustmann

Subjects
chemistry.chemical_classification, Radical, Intermolecular force, Free-radical reaction, chemistry.chemical_element, Halocarbon, Photochemistry, Inorganic Chemistry, Chromium, chemistry.chemical_compound, chemistry, Carbon–carbon bond, Polymer chemistry, Aliphatic compound, Alkyl
Abstract

Chromium(II) complexes are found to be effective mediators for intermolecular free-radical C–C bond formation. Thus, Cr(en)22+ species react with alkyl halides to generate the corresponding alkyl radicals which are readily trapped with electron-deficient alkenes to afford the coupling products.

Published
1992

6. Substituent effects in cycloheptatrienyl radicals: An ESR spectroscopic study

Author

Hasan Tashtoush, Fritz Lange, Reiner Sustmann, and Dieter Brandes

Subjects
chemistry.chemical_compound, chemistry, Nitrile, Bicyclic molecule, Radical, Adamantane, Kinetic isotope effect, Substituent, General Materials Science, General Chemistry, Photochemistry, Hyperfine structure, Acceptor
Abstract

ESR spectral parameters of methoxy-, hydroxy- and cyano-substituted cycloheptatrienyl radicals are reported. The radicals were obtained in adamantane matrices by the rearrangement of substituted bicyclo[3.2.0]heptadienyl radicals. The hyperfine splitting parameters are interpreted in terms of the effect of donor and acceptor substituents on the degeneracy of the relevant singly occupied ψs or ψA ABMO of the cycloheptatrienyl radical. In addition, an attempt was made to study the deuterium isotope effect on the degenerate MOs at low temperatures in a [2H16]adamantane matrix.

Published
1989

7. ChemInform Abstract: Reactions of Alkylmercurials with Heteroatom-Centered Acceptor Radicals

Author

Hasan Tashtoush, Glen A. Russell, Rajive K. Khanna, Preecha Ngoviwatchai, and Anna. Pla-Dalmau

Subjects
Alkylmercurials, Chemistry, Radical, Heteroatom, General Medicine, Photochemistry, Medicinal chemistry, Acceptor
Abstract

En particulier, reactivite relative de chlorures d'alkylmercures vis-a-vis de PhS • , PhSe • et I • generes a partir du disulfure de phenyle, diseleniure de phenyle et du β-iodo styrene ou du (diphenyl-1,1 iodo-2) ethylene

Published
1988

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