𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Dynamic NMR study of the factors governing nitroso group rotation in p-nitrosoanilines in the solution and solid states

✍ Scribed by Daniel A. Fletcher; Brian G. Gowenlock; Keith G. Orrell; Vladimir Šik

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
690 KB
Volume
33
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The energy barriers associated with NO rotation in a series of p‐nitrosoanilines were measured by the total bandshape NMR method. Energies [Δ__G__^‡^ (298.15 K)] are in the range 38–57 kJ mol^−1^, the magnitudes being lowered appreciably by the presence of methyl substituents flanking the nitroso group on either side. In the case of p‐nitroso‐N,N‐dimethylaniline, NO rotation has been shown to occur also in the solid state with a slightly higher energy barrier to that in the dissolved state. For p‐nitroso‐N‐methylaniline, a combination of 2D‐exchange spectroscopy (EXSY) and 1D‐bandshape analysis NMR methods enabled the barriers to NO rotation and NHMe rotation to be measured separately.

📜 SIMILAR VOLUMES

Restricted rotation of the phenyl group
Restricted rotation of the phenyl group in β-hydroxyphosphonates: Dynamic NMR and semiempirical studies
✍ Nikolay G. Vassilev; Valentin S. Dimitrov 📂 Article 📅 1994 🏛 John Wiley and Sons 🌐 English ⚖ 515 KB

## Abstract Free energies of activation, Δ__G__, for the rotation of the phenyl group in the range of 46.06–63.25 kJ mol^−1^ were observed in some model β‐hydroxyphosphonates. These barriers were found to depend on the type of substituents at the phosphorus atom and on the substituents at the β‐pos

Solid-state 2H NMR study of the dynamics
Solid-state 2H NMR study of the dynamics of the methoxy groups in perdeuteriated bis(dimethoxythiophosphoryl) disulphide
✍ Marek J. Potrzebowski 📂 Article 📅 1992 🏛 John Wiley and Sons 🌐 English ⚖ 442 KB

## Abstract ^2^H solid‐state NMR was employed to study the statio and dynamic properties of perdeuteriated bis(dimethoxythiophosphoryl) disulphide. It was found that sample preparation has a significant influence on the line shapes of the broad‐line solid‐state spectra. It was concluded from invers

A solid state and solution NMR study of
A solid state and solution NMR study of the tautomerism in hydroxyquinoline carboxylic acids
✍ Dietrich Gudat; Jacek E. Nycz; Jaroslaw Polanski 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 156 KB 👁 1 views

Some hydroxyquinoline carboxylic acids and their conjugate acids and bases were characterized by 13 C and 15 N NMR spectroscopy in solution and in the solid state. Differences in 13 C and, in particular, 15 N chemical shift patterns allow to distinguish between individual tautomers and confirm the p

13C CP/MAS NMR study of a phenyl group r
13C CP/MAS NMR study of a phenyl group rotation in the solid state using T1ρ, lineshape and 2D EXSY measurements
✍ Frank G. Riddell; Murray Bremner; John H. Strange 📂 Article 📅 1994 🏛 John Wiley and Sons 🌐 English ⚖ 316 KB

## Abstract A combination of solid‐state ^13^C CP/MAS NMR methods was used to study the rates of rotation of the phenyl group in 3,5‐dimethyl‐1‐phenylhex‐1‐yn‐3‐ol. The methods used were __T__~1ρ~ measurements, lineshape analysis and 2D exchange spectroscopy over the temperature range 219–284 K. Th