𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Two-bond 13C-13C spin-coupling constants in carbohydrates: effect of structure on coupling magnitude and sign

✍ Scribed by Timothy Church; Ian Carmichael; Anthony S. Serianni

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
465 KB
Volume
280
Category
Article
ISSN
0008-6215

No coin nor oath required. For personal study only.

✦ Synopsis

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 the new approach, producing results which may prove useful in the conformational analysis of O-glycosidic linkages in oligosaccharides. High-level at) initio calculations of 2Jcc values in model compounds were found to be in agreement with the predictions.

📜 SIMILAR VOLUMES

The structural dependence of two-bond 13
The structural dependence of two-bond 13C13C coupling constants
✍ Martin Klessinger; Michael Stöcker 📂 Article 📅 1981 🏛 John Wiley and Sons 🌐 English ⚖ 452 KB

## Abstract Two‐bond ^13^C^13^C coupling constants are discussed on the basis of INDO‐SCPT calculations. The dependence of ^2^__J__(CC) on bond angle variation and on methyl substitution is evaluated, and it is shown that ^2^__J__(CC) depends linearly on the bond orbital __s__‐character product of

13C-1H spin-coupling constants in carboh
13C-1H spin-coupling constants in carbohydrates: magnitude and sign determinations via 2D NMR methods
✍ Anthony S. Serianni; Carol A. Podlasek 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 700 KB

Conformational analysis of carbohydrates has depended, in large part, on the use of three-bond (vicinal) IH\_1H spin-coupling constants (31HH)' whose magnitudes can be correlated with molecular torsion angles, as first enunciated by Karplus [1]. In the ensuing years, more sophisticated Karplus relat

Verification of the Projection Resultant
Verification of the Projection Resultant Method for Two-Bond13C–13C Coupling Sign Determinations in Carbohydrates
✍ Anthony S. Serianni; Paul B. Bondo; Jaroslav Zajicek 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 143 KB

Structural analysis of carbohydrates in solution has de-An empirical method was proposed recently ( 14) that predicts the magnitudes and signs of 2 J CCC and 2 J COC values pended heavily on the interpretation of vicinal 1 H-1 H spin couplings ( 3 J HH ) which can be related to molecular H-C-in carb

13C13C spin–spin coupling constants and
13C13C spin–spin coupling constants and 13C isotope effects on 13C chemical shifts in some 4-membered rings
✍ Jukka Jokisaari 📂 Article 📅 1978 🏛 John Wiley and Sons 🌐 English ⚖ 272 KB

## Abstract The ^13^C^13^C spin–spin coupling constants in natural abundance oxetane, thietane, cyclobutanone, bromo‐and chlorocyclobutane have been measured. Furthermore, the ^13^C isotope‐induced changes in the chemical shifts of the different ^13^C nuclei in the molecules mentioned above are re

Vicinal 13C13C spin–spin coupling consta
Vicinal 13C13C spin–spin coupling constants of 1-butanols. Conformational and substituent effects
✍ James L. Marshall; Shareen A. Conn; Michael Barfield 📂 Article 📅 1977 🏛 John Wiley and Sons 🌐 English ⚖ 376 KB

## Abstract A series of (>90% isotopic purity) ^13^C‐labeled aliphatic alcohols of the general structure CCC^13^COH were synthesized and studied by ^13^C n.m.r. to obtain all ^13^C^13^C couplings involving the labeled carbon. The ^2^__J__(CC) values were small (<0.5 Hz) and contrast with the l