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NMR studies on the ligand exchange reactions between diaryl tellurides and phenyllithium: Detection of hypervalent triaryl tellurium ate complexes

✍ Scribed by Satoshi Ogawa; Yutaka Masutomi; Naomichi Furukawa; Tomoki Erata

Publisher: John Wiley and Sons
Year: 1992
Tongue: English
Weight: 550 KB
Volume: 3
Category: Article
ISSN: 1042-7163
DOI: 10.1002/hc.520030417

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✦ Synopsis

Diaryl tellurides undergo rapid Iigand exchange and disproportionation reactions on treatment with phenyllithium at -78°C. Triaryltelluranes [lo-Te-3(C,)]-Li were identified as discrete intermediates during the reactions by '"Te, ' H , I3C, and CH-COSY N M R studies.

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Pentafluorophenyl phenyl telluride (1) and 3,5-dichloro-2,4,6-trifluorophenyl phenyl telluride (2) react with pentafluorophenyllithium or 3,5-dichloro-2,4,6trifluorophenyllithium in THF at low temperatures to form the corresponding tellurium ate complexes (A) and (B) as sole intermediates in the lig