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Carbon‐13 spectra of some heterocyclic analogues of biphenylene
Author(s) -
MacBride J. A. Hugh,
Leow Mei Ling,
Wright the late Peter M.,
Kilcoyne John P.,
Wakefield Basil J.
Publication year - 1987
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260250907
Subject(s) - biphenylene , benzothiophene , chemistry , chemical shift , ring (chemistry) , spectral line , coupling constant , nitrogen , nmr spectra database , stereochemistry , computational chemistry , organic chemistry , thiophene , phenylene , physics , particle physics , astronomy , polymer
The 13 C chemical shifts for 2,7‐, 1,8‐ and 1,6‐diazabiphenylenes are reported, together with some coupling constants and the 13 C chemical shifts of a benzothiophene analogue of biphenylene. The results can be explained by the existence of a paramagnetic ring current in the four‐membered ring of the nitrogen‐containing compounds which is absent in the case of the benzothiophene. A possible explanation is offered.