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Selenium‐77 nuclear magnetic resonance in mono‐ and disubstituted benzo[ b ]selenophenes
Author(s) -
Baiwir Marcel,
Llabrès Gabriel,
Christiaens Léon,
Piette JeanLouis
Publication year - 1981
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.1270160105
Subject(s) - chalcogen , substituent , selenium , chemistry , chemical shift , nuclear magnetic resonance , stereochemistry , crystallography , organic chemistry , physics
The 77 Se chemical shifts of 79 mono‐ or disubstituted benzo[ b ]selenophenes are reported. The results in the 2‐ and 3‐substituted derivatives closely parallel those previously obtained in the corresponding selenophenes. The measured parameters also correlate well with those measured in benzo[ b ]tellurophenes. The 125 Te and 77 Se chalcogen nuclei appear to be much more sensitive to substituent effects than the more classical nuclei. The effects of Cr(acac) 3 , Eu(dpm) 3 and concentration on the 77 Se NMR spectra are briefly discussed.