ISSN:
0749-1581
Keywords:
125Te NMR
;
13C NMR
;
1H NMR
;
diorganotellurium(II) compounds
;
tetraorganotellurium(IV) compounds
;
substituent effects
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
125Te, 13C and 1H NMR studies on a series of symmetric diorganotellurium(II) [R2 Te, where R = Me, Et, n-Bu, CH2SiMe3, allyl, vinyl, C≡CMe, C≡CEt, C≡C(n-Pr), C≡C(t-Bu), C≡C(SiMe3) 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) (R4Te, where R = Me, n-Bu, CH2SiMe3 and vinyl) compounds are presented. 125Te was acquired under 1H-decoupled and 1H-coupled conditions. Whereas the 1H-decoupled 125Te NMR spectra are extremely useful in identifying low levels of tellurium containing impurities, the 1H-coupled 125Te experiments allow for structure determination and identification of long- and short-range coupling pathways. 1H and 13C 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. 125Te satellites are observed in the 1H and 13C 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.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/mrc.1260330606
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