𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Proton Detection of Carbon–Carbon Spin Coupling Constants in Symmetrical Molecules

✍ Scribed by Stefan Berger

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
49 KB
Volume
142
Category
Article
ISSN
1090-7807

No coin nor oath required. For personal study only.

✦ Synopsis

A new method is shown to determine C,C spin coupling constants in C 2 symmetric molecules by using proton detection with gradient selected 2QHMBC. It is shown that the pulse sequence proposed distinguishes between symmetric and antisymmetric eigenfunctions of the AAXX spin system.

📜 SIMILAR VOLUMES

Carbon-13, proton spin–spin coupling con
Carbon-13, proton spin–spin coupling constants in some 2-substituted propanes
✍ Roderick E. Wasylishen; Kalvin Chum; John Bukata 📂 Article 📅 1977 🏛 John Wiley and Sons 🌐 English ⚖ 366 KB

## Abstract Carbon‐13, proton coupling constants have been measured in eighteen different 2‐substituted propanes. ^1^__J__(C‐2,H) shows variations similar to those observed previously for monosubstituted methanes. ^2^__J__(C‐2,H) is essentially independent of the substituent at C‐2, while ^2^__J__(

Measurement of long-range proton—carbon
Measurement of long-range proton—carbon coupling constants in medium-sized molecules
✍ Miloš Hricovíni; Tibor Liptaj 📂 Article 📅 1989 🏛 John Wiley and Sons 🌐 English ⚖ 295 KB 👁 1 views

A m d i e d version of the two-dimensional semiselective INEPT experiment is presented which allows the determination of long-range protowarbon couplings in medium-sized molecules. The difference in the TI relaxation times is utilized for the reduction of the number of protons from which coherence i

Long range carbon–proton coupling consta
Long range carbon–proton coupling constants in pyridine
✍ Goh Miyajima; Kensuke Takahashi; Hiroshi Sugiyama 📂 Article 📅 1974 🏛 John Wiley and Sons 🌐 English ⚖ 234 KB 👁 1 views

## Abstract Carbon‐13 NMR spectra of pyridine have been observed by using the slow scan technique in the absorption mode. The long range coupling constants between carbon‐13 and protons have been obtained and assigned by the isotope substitution method.

Carbon-proton coupling constants in α-ch
Carbon-proton coupling constants in α-chlorostyrene-α-13C
✍ Kenneth L. Servis; Joseph Casanova Jr.; Manfred Geisel 📂 Article 📅 1969 🏛 John Wiley and Sons 🌐 English ⚖ 198 KB

The two stereochemically distinct two-bond carbon-13-hydrogen coupling constants J(13C-CH), for cr-chloro~tyrene-a-'~C have been shown to be of similar magnitude but opposite sign (-6.3 and 1 5 . 6 Hz). A simple additivity relationship which adequately reproduces all the reported J(13C-CH) values fo