## Abstract Analysis of the noise decoupled ^13^C spectra of doubly ^13^C labelled compounds where the two labelled carbons are identical, makes the determination of reltive signs of ^13^C^13^C coupling constants possible in a very simple way. The involved carbon form AA'X or AA'B spin systems.
Sign determination of 13C13C coupling constants by sign-labeled polarization transfer
✍ Scribed by O.W Sørensen; R.R Ernst
- Publisher
- Elsevier Science
- Year
- 1983
- Weight
- 720 KB
- Volume
- 54
- Category
- Article
- ISSN
- 0022-2364
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## Abstract Magnitudes and signs of ^13^C^13^C coupling constants in compounds of the type Ph^13^CR^1^R^2^^13^CR^1^R^2^Ph have been determined and the results are discussed in a broader context. Two types of coupling constants, __J__(C‐i, C‐α) and __J__(C‐i, C‐β), between aromatic carbon atoms an
An empirical projection method is described to predict the magnitudes and signs of two-bond 13C-13C spin-coupling constants (2Jcc) in aldopyranosyl rings. The method has been applied primarily to the interpretation of 2Jcc c values, although the behavior of 2Jco c has also been examined in light of