Chromone Studies. Part 9.1 Dynamic NMR Analysis of Rotational Isomerism in 2-(N,N-Dialkylamino)chromones

1997 ◽  
pp. 414
Author(s):  
Perry T.Kaye Kaye ◽  
Isaiah D. I. Ramaite
Keyword(s):  
Rotational Isomerism ◽  
Dynamic Nmr ◽  
Nmr Analysis

Benzotriazolium ylides: Experimental and theoretical study on the tautomeric equilibrium of monosubstituted benzotriazolium ylides

2003 ◽  
Vol 81 (5) ◽  
pp. 350-356 ◽  
Author(s):  
Neculai Doru Miron ◽  
Patrice Woisel ◽  
Georgiana G Surpateanu ◽  
Gérard Vergoten ◽  
Ludovic Depature ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Theoretical Study ◽  
Tautomeric Equilibrium ◽  
Semiempirical Calculations ◽  
Dynamic Nmr ◽  
Nmr Analysis ◽  
Tautomeric Forms ◽  
Synthetic Procedure

The biphenacyl benzotriazolium salts 12 give a tautomeric equilibrium 13[Formula: see text]14 in the presence of triethylamine (TEA) or NaOH. The evaluation of this tautomeric equilibrium has been studied using a dynamic NMR analysis and a new synthetic procedure of disubstituted benzotriazolium ylides 15 and 16, which have in their structures a picryl fragment. This study also includes a theoretical analysis on the reactivity of salts 12a–c and the thermodynamical stability of tautomeric forms 13 and 14 by AM1 and PM3 procedure methods.Key words: synthesis, salts, ylides, semiempirical calculations, kinetics.

Approaches to the Potential Chirality of Bisguanidinobenzenes by Dynamic NMR Analysis

2007 ◽  
Vol 80 (6) ◽  
pp. 1187-1193 ◽  
Author(s):  
Waka Nakanishi ◽  
Tsutomu Ishikawa ◽  
Davor Margetic
Keyword(s):  
Dynamic Nmr ◽  
Nmr Analysis

ChemInform Abstract: Indolizine Studies. Part 3. Synthesis and Dynamic NMR Analysis of Indolizine-2-carboxamides.

ChemInform ◽  
2010 ◽  
Vol 26 (14) ◽  
pp. no-no
Author(s):  
M. L. BODE ◽  
P. T. KAYE ◽  
R. GEORGE
Keyword(s):  
Dynamic Nmr ◽  
Nmr Analysis

Hindered Rotation in New Air-Stable Ruthenium Olefin Metathesis Catalysts with Chromanylmethylidene Ligands

2009 ◽  
Vol 62 (10) ◽  
pp. 1363 ◽  
Author(s):  
Agnieszka Hryniewicka ◽  
Jacek W. Morzycki ◽  
Leszek Siergiejczyk ◽  
Stanisław Witkowski ◽  
Jacek Wójcik ◽  
...  
Keyword(s):  
Olefin Metathesis ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Asymmetric Induction ◽  
Dynamic Nmr ◽  
Nmr Analysis ◽  
Ring Closing Metathesis ◽  
Hindered Rotation ◽  
Metathesis Catalysts ◽  
First Time

Three new ruthenium complexes with chromanylmethylidene ligands were synthesized and dynamic NMR analysis of these compounds was carried out. The activation energy for the C–Ru rotation was measured for the first time and found to be of ~60 kJ mol–1. The complexes may potentially serve as latent catalysts for olefin metathesis – they promote the simple ring-closing metathesis reactions very slowly at room temperature, but are much more active at slightly elevated temperatures. No asymmetric induction was observed when the chiral α-tocopherol-derived catalyst was used.

Highly twisted carbazole-borane derivatives. B-N Stereodynamic analysis and consequences on their emission properties.

2021 ◽  
Author(s):  
Daniel Pecorari ◽  
Andrea Mazzanti ◽  
Stefano Gianvittorio ◽  
Simone Foschi ◽  
Stefano Stagni ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Dynamic Nmr ◽  
Nmr Analysis ◽  
Emission Properties

The stereodynamic properties of amino bis-mesityl-boranes bearing carbazole and benzocarbazole as the donor heterocycle have been investigated by dynamic NMR analysis and simulated by DFT calculations. The π-contribution to the...

Dynamic NMR study of rotational isomerism in the carbanion ofp-trifluoromethanesulfonylbenzyltriflone in aprotic solvents

2000 ◽  
Vol 38 (8) ◽  
pp. 655-661 ◽  
Author(s):  
Marina Gromova ◽  
Claude G. B�guin ◽  
R�gis Goumont ◽  
Nicolas Faucher ◽  
Marc Tordeux ◽  
...  
Keyword(s):  
Rotational Isomerism ◽  
Aprotic Solvents ◽  
Dynamic Nmr ◽  
Nmr Study
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