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An 1 H and 13 C NMR study of pentane‐2,4‐dione tellurium(II) compounds; chemical shifts, 125 Te 1 H and 125 Te 13 C couplings
Author(s) -
Dewan John C.,
Jennings W. Brian,
Silver Jack,
Tolley Malcolm S.
Publication year - 1978
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270110906
Subject(s) - tellurium , geminal , pentane , coupling constant , stereospecificity , chemistry , cyclohexane , chemical shift , stereochemistry , ring (chemistry) , crystallography , physics , organic chemistry , particle physics , catalysis
1 H and 13 C NMR data are reported for pentane‐2,4‐dione tellurium(II) compounds which contain a 6‐membered tellurane ring bearing methyl or ethyl substituents. The 125 TeCH coupling constants are particularly interesting in that they are highly stereospecific, viz. ∼60 Hz and 0–8 Hz for equatorial and axial protons, respectively, in the chair conformation. 1 J (TeC) and 2 J (TeCC) couplings lie in the ranges 118–146 Hz and 44–49 Hz, respectively. Geminal HCH couplings in these compounds (9–11 Hz) are lower than analogous values in tellurane or in cyclohexane‐1,3‐diones.