125Te, 13C and 1H NMR characterization of a series of diorganotellurium(II) and tetraorganotellurium(IV) compounds

✍ Scribed by Robert W. Gedridge Jr; Kelvin T. Higa; Robin A. Nissan

• Book ID: 102952467
• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 578 KB
• Volume: 33
• Category: Article
• ISSN: 0749-1581
• DOI: 10.1002/mrc.1260330606

✦ Synopsis

Abstract

^125^Te, ^13^C and ^1^H NMR studies on a series of symmetric diorganotellurium(II) [R~2~ Te, where R = Me, Et, n‐Bu, CH~2~SiMe~3~, allyl, vinyl, CCMe, CCEt, CC(n‐Pr), CC(t‐Bu), CC(SiMe~3~) and CCPh], unsymmetric diorganotellurium(II) (RTeR′) (where R = allyl, R′ = Me, Et, i‐Pr, t‐Bu; R = Me and R′ = benzyl), symmetric bis(alkyltelluro)ethyne (RTeC=CTeR, where R = Me and Et) and symmetric tetraorganotellurium(IV) (R~4~Te, where R = Me, n‐Bu, CH~2~SiMe~3~ and vinyl) compounds are presented. ^125^Te was acquired under ^1^H‐decoupled and ^1^H‐coupled conditions. Whereas the ^1^H‐decoupled ^125^Te NMR spectra are extremely useful in identifying low levels of tellurium containing impurities, the ^1^H‐coupled ^125^Te experiments allow for structure determination and identification of long‐ and short‐range coupling pathways. ^1^H and ^13^C NMR were used to assess purity in terms of organic materials which can include solvents, decomposition byproducts and unwanted organometallic compounds from side reactions occurring during synthesis. ^125^Te satellites are observed in the ^1^H and ^13^C NMR spectra and are useful in resonance assignments and in identification of long‐ and short‐range coupling pathways. The effects of substituents on chemical shifts and coupling constants are discussed.