𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Long range carbon–proton coupling constants in pyridine

✍ Scribed by Goh Miyajima; Kensuke Takahashi; Hiroshi Sugiyama


Publisher
John Wiley and Sons
Year
1974
Tongue
English
Weight
234 KB
Volume
6
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis


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.


📜 SIMILAR VOLUMES


Long-range proton–carbon coupling consta
✍ Torgny Rundlöf; Alexandra Kjellberg; Charlotta Damberg; Toshiaki Nishida; Göran 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 269 KB 👁 1 views

Long-range heteronuclear coupling constants, 3J(C,H), were measured across glycosidic linkages in b-linked disaccharides and also for vicinally disubstituted trisaccharides. One-dimensional multiple-site 13C excitation experiments using Hadamard spectroscopy and band-selective 1H decoupling during t

Long-range proton-carbon coupling consta
✍ Teodor Parella; Francisco Sánchez-Ferrando; Albert Virgili 📂 Article 📅 1995 🏛 John Wiley and Sons 🌐 English ⚖ 403 KB 👁 1 views

## Abstract Long‐range proton‐carbon coupling constants, __^n^J__~CH~, were measured for some simple norbornene derivatives. Among the influence of substitution pattern, a study of the experimental influence of the double bond in the norbornene skeleton on ^2^__J__~CH~ and ^3^__J__~CH~ was made, ta

Measurement of long-range proton—carbon
✍ 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 couplings in st
✍ Vratislav Blechta; Federico del Río-Portilla; Ray Freeman 📂 Article 📅 1994 🏛 John Wiley and Sons 🌐 English ⚖ 367 KB 👁 1 views

## Abstract Long‐range ^13^C,H NMR coupling constants were measured in strychnine at 400 MHz by a method that employs selective excitation of individual ^13^C sites under decoupled conditions followed by polarization transfer to protons. The sensitivity was improved by performing eight simultaneous

Hadamard long-range proton-carbon coupli
✍ T. Nishida; G. Widmalm; P. Sandor 📂 Article 📅 1995 🏛 John Wiley and Sons 🌐 English ⚖ 255 KB 👁 1 views

## Abstract Long‐range ^13^C^1^H coupling constants were measured by using multiple‐site selective excitation followed by polarization transfer and acquisition under band‐selective proton decoupling conditions. The multiple‐site proton decoupling eliminates splittings due to homonuclear spin coupl

Hadamard Long-Range Proton–Carbon Coupli
✍ T. Nishida; G. Widmalm; P. Sándor 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 416 KB 👁 1 views

## Sources of artifacts in Hadamard spectra were investigated and identified as insufficient suppression of signals from solvent, protons attached to "C atoms and error signals caused by non-ideal excitation and the subsequent Hadamard transformation. Pulsed field gradients (PFG) effectively elimi