𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Carbon-13 NMR study of enamines and enamino ketones. A direct observation of the conformation of the 2-methylcyclohexanone enamine tautomers

✍ Scribed by D. Tourwé; G. Van Binst; S. A. G. De Graaf; U. K. Pandit


Publisher
John Wiley and Sons
Year
1975
Tongue
English
Weight
704 KB
Volume
7
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis


Abstract

The carbon‐13 spectra of a series of cyclohexanone, cyclopentanone and 2‐methylcyclohexanone enamines are reported. The influence of the amino component was studied in a series of enamino ketones. The spectra reflect the amount of p‐π overlap in the molecules and their conformation. Differences between 5‐and 6‐membered carbonyl components are evaluated.


📜 SIMILAR VOLUMES


Conformational analysis: Part 37. A 13C
✍ Douglas S. Ribeiro; Raymond J. Abraham 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 134 KB

## Abstract The free energy of the axial–equatorial equilibrium of 2‐methylcyclohexanone oxime (1E) and the corresponding __O__‐methyl oxime (2E) was determined by a novel curve‐fitting analysis of the temperature dependence of the carbon chemical shifts and by the vicinal proton–proton coupling co

Conformational studies by nuclear magnet
✍ Janusz Da̧browski; Krystyna Kamieńska-Trela; Lech Kozerski 📂 Article 📅 1974 🏛 John Wiley and Sons 🌐 English ⚖ 348 KB 👁 1 views

## Abstract Carbon‐13 magnetic resonance spectra of the s‐__cis__ and s‐__trans__ rotamers of enamino ketones and thiones of the general formula \documentclass{article}\pagestyle{empty}\begin{document}${\rm X =}\mathop {\rm C}\limits^{\rm 1} {\rm (}\mathop {\rm R}\limits^{\rm 1} {\rm)}\mathop {\rm

A Study of stepwise conformational chang
✍ Shigeru Sase; Yasuyuki Suzuki; Yoshio Inoue; Riichirô Chûjô 📂 Article 📅 1977 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 648 KB

The helix-coil transition for poly(P-benzyl-L-aspartate) [poly(Asp[OBzl])] in solvent mixtures of trifluoroacetic acid/deuterated chloroform (F3AcOH/CDC13) was studied by means of proton and carbon-13 nmr. Conformational fixation of the side chain occurs before the coil-helix transition of the backb

Benzo- and indoloquinolizines. XII—carbo
✍ G. Van Binst; G. Laus; D. Tourwé 📂 Article 📅 1977 🏛 John Wiley and Sons 🌐 English ⚖ 270 KB

## Abstract The influence of the configuration and the conformation on the ^13^C n.m.r. spectrum of 1,2,3,4,4a,6,7,8,9,13b‐decahydro‐9a__H__‐pyrido[1,2‐__f__] phenanthridine was investigated. These observations, coupled with the low temperature spectrum allowed us to confirm the __trans__‐__syn__‐_

1H and 13C NMR studies on the conformati
✍ Robert Glaser; Michael A. Bernstein; Ayala Balan 📂 Article 📅 1991 🏛 John Wiley and Sons 🌐 English ⚖ 768 KB

## Abstract The ^1^H (300 MHz) and ^13^C (75.5 MHz) NMR spectra (CDCl~3~) of __N__‐desmethyl‐__N__,__O__‐diacetyl‐α‐metazocine showed two (__E__,__Z__)‐amide diastereomers (ratio ≈︁ 1 : 2, respectively). All four vicinal proton‐proton coupling constants in each NCH~2~CH~2~C moiety were readily meas