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Please use this identifier to cite or link to this item: http://dspace.utalca.cl/handle/1950/4894

Title: Electrospray ionization mass spectrometric characterization of key Te(IV) cationic intermediates for the addition of TeCl4 to alkynes
Authors: Santos, L.S.
Cunha, Rlor
Comasseto, J.V.
Eberlin, M.N.
Issue Date: 2007
Publisher: Wiley Interscience
Citation: Rapid Communications in Mass Spectrometry 21(9):1479-1484
Abstract: Tellurium tetrachloride adds to alkynes via two pathways: a concerted syn-addition that yields Z-tri- and -tetrasubstituted alkenes or an anti-addition that yields E-alkenes. The mechanistic aspects of these divergent pathways for TeCl4 addition to alkynes have been investigated by on-line electrospray ionization (tandem) mass spectrometry (ESI-MS(/MS)). Via ESI-MS(/MS), we have been able to intercept and characterize the active electrophile TeCl in tetrahydrofuran (THF) solutions of TeCl4, as well as its THF complex and several TeClx(OH) derivatives. For the first time, also, key Te(IV) cationic intermediates of the electrophilic addition of TeCl4 to alkynes were captured for gas-phase MS investigation. The detailed structural data of cyclic tellurane intermediates intercepted herein seems to provide insights into the coordinative behavior of the Te(IV) atom and its mode of action towards biological targets. Copyright © 2007 John Wiley & Sons, Ltd.
Description: Leonardo Silva Santos. Universidad de Talca, Instituto de Química de Recursos Naturales, P.O. Box 747, Talca, Chile.
URI: http://dspace.utalca.cl/handle/1950/4894
ISSN: 0951-4198
Appears in Collections:Artículos en publicaciones ISI - Universidad de Talca

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