Are Ate Complexes True Intermediates in Lithium-Metalloid Exchange? Subtle Effects of Ion-Pair Structure in Lithium-Tellurium and Lithium-Selenium Exchange Reactions

Are Ate Complexes True Intermediates in Lithium-Metalloid Exchange? Subtle Effects of Ion-Pair Structure in Lithium-Tellurium and Lithium-Selenium Exchange Reactions

Li/Te exchange via the ate complex with no contribution from direct exchange (i.e., kd=0) was demonstrated by NMR studies on an intermolecular reaction (see scheme; M=Te, Ar=5‐diphenylphosphanyl‐2‐thienyl). In contrast, in an intramolecular Li/Se exchange reaction, direct exchange bypasses the obser...

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Veröffentlicht in:Angewandte Chemie International Edition 2002-09, Vol.41 (18), p.3436-3439
Hauptverfasser: Reich, Hans J., Bevan, Martin J., Gudmundsson, Birgir Ö., Puckett, Craig L.
Format: Artikel
Sprache:eng
Schlagworte:
ate complexes
lithiation
NMR spectroscopy
selenium
tellurium
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Zusammenfassung:Li/Te exchange via the ate complex with no contribution from direct exchange (i.e., kd=0) was demonstrated by NMR studies on an intermolecular reaction (see scheme; M=Te, Ar=5‐diphenylphosphanyl‐2‐thienyl). In contrast, in an intramolecular Li/Se exchange reaction, direct exchange bypasses the observable ate complex (kd≫kate).
ISSN:1433-7851
1521-3773
DOI:10.1002/1521-3773(20020916)41:18<3436::AID-ANIE3436>3.0.CO;2-D