Low Temperature Multinuclear NMR Study of the Mechanism of Protonation of W(H)2Cl2(PMe2Ph)4

1995 ◽  
Vol 34 (11) ◽  
pp. 2894-2901 ◽  
Author(s):  
Helmut Rothfuss ◽  
Dmitry G. Gusev ◽  
Kenneth G. Caulton
Keyword(s):  
Low Temperature ◽  
Multinuclear Nmr ◽  
Nmr Study

Dynamisches Verhalten dimerer 1,3,2,4λ2-Diazasilastannetidine und -plumbetidine in Lösung — eine Multikern-NMR-Studie/Dynamic Behaviour of Dimeric 1,2,3,4λ2-Diazasilastannetidines and -plumbetidines in Solution — a Multinuclear NMR Study

1989 ◽  
Vol 44 (3) ◽  
pp. 288-292 ◽  
Author(s):  
Bernd Wrackmeyer ◽  
Klaus Horchler ◽  
Hong Zhou ◽  
Michael Veith
Keyword(s):  
Low Temperature ◽  
Dynamic Process ◽  
Room Temperature ◽  
Dynamic Behaviour ◽  
The Other ◽  
Multinuclear Nmr ◽  
Nmr Data ◽  
Nmr Study ◽  
Intramolecular Process

1,3-Diisopropyl-2,2-dimethyl-1,3,2,4λ2-diazasilastannetidine (1b) and -plumbetidine (2b) are dimeric [(1b)2, (2b)2] in solution. At room temperature the structure of (1b)2 is fluxional. The dynamic behaviour is interpreted - on the basis of 1H. 13C, 29Si and 119Sn NMR data - as an intramolecular process in which the four-membered rings keep their identity. Such a process involves either concerted opening of the two coordinative Sn - N bonds and mutual slippage of the two rings, or consecutive cleavage of one of the coordinative Sn - N bonds and rotation about the other one. At room temperature the dimer (2b)2 is in equilibrium with its monomer 2b, whereas at low temperature the dynamic process corresponds to that established for (1b)2. In solutions which contain a mixture of the dimers (1b)2 and (2b)2, the presence of the mixed dimer 1b/2b can be proved unambiguously by consistent 29Si, 119Sn and 207Pb NMR data.

A multinuclear NMR study of the cycloaddition reaction of SNSAsF6 with tert-butylphosphaacetyline (CH3)3CCP leading to the 5-tert-butyl-1,3,2,4-dithiazaphospholium cation; a preliminary account of the novel exchange of a cyclic phosphorus by nitrogen in the reaction of with azide N3− leading to 5-tert-butyl-1,3,2,4-dithiadiazolyl

1995 ◽  
Vol 73 (8) ◽  
pp. 1312-1320 ◽  
Author(s):  
Simon Parsons ◽  
Jack Passmore ◽  
Xiaoping Sun ◽  
Manfred Regitz
Keyword(s):  
Sulfur Dioxide ◽  
Low Temperature ◽  
Cycloaddition Reaction ◽  
The Novel ◽  
Multinuclear Nmr ◽  
Tert Butyl ◽  
Nmr Study ◽  
Preliminary Account ◽  
Net Replacement

The cycloaddition reaction of SNS+ (as the AsF6− salt) with 5-tert-butylphosphaacetyline (CH3)3CCP in sulfur dioxide solution at −60 °C gave [Formula: see text], the first identified example of a 1,3,2,4-dithiazaphospholium heterocycle [Formula: see text]. The cycloadduct was characterized by multinuclear NMR (1H, 13C, 14N, 15N, 31P) spectroscopy at low temperature. Reduction of 6π [Formula: see text] in situ with SbPh3 in the presence of Me4NCl led to a radical, which may be the 7π tert-butyl-1,3,2,4-dithiazaphospholyl [Formula: see text]. The reaction of 5-tert-butyl-1,3,2,4-dithiazaphospholium [Formula: see text] with azide N3− surprisingly gave the previously known 5-tert-butyl-1,3,2,4-dithiadiazolyl [Formula: see text]. The conversion of [Formula: see text] to [Formula: see text] by the net replacement of a cyclic phosphorus with nitrogen is unprecedented. Keywords: dithiazaphospholium, dithiazaphospholyl, cycloaddition, multinuclear NMR, ESR.

Arylation of enelactams using TIPSOTf: reaction scope and mechanistic insight

2021 ◽  
Author(s):  
Tomasz J. Idzik ◽  
Zofia M. Myk ◽  
Łukasz Struk ◽  
Magdalena Perużyńska ◽  
Gabriela Maciejewska ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Multinuclear Nmr ◽  
Mechanistic Insight ◽  
Nmr Study ◽  
Wide Range

Triisopropylsilyltrifluoromethanesulfonate can be effectively used for the arylation of a wide range of enelactams. The multinuclear NMR study provided deep insights into the reaction mechanism.

scholarly journals 21Ne and 131Xe NMR study of electric field gradients and multinuclear NMR study of the composition of a ferroelectric liquid crystal

2018 ◽  
Vol 149 (23) ◽  
pp. 234901 ◽  
Author(s):  
Susanna K. Ahola ◽  
Petri Ingman ◽  
Reino Laatikainen ◽  
Jari Sinkkonen ◽  
Jukka Jokisaari
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Ferroelectric Liquid Crystal ◽  
Electric Field Gradients ◽  
Multinuclear Nmr ◽  
Field Gradients ◽  
Nmr Study

scholarly journals 51V-NMR study of low-temperature phase in δ-Ag2/3V2O5

2015 ◽  
Vol 592 ◽  
pp. 012042 ◽  
Author(s):  
Y Kawasaki ◽  
R Morioka ◽  
Y Kishimoto ◽  
K Nakamura ◽  
K Nishiyama ◽  
...  
Keyword(s):  
Low Temperature ◽  
Temperature Phase ◽  
51V Nmr ◽  
Nmr Study ◽  
Low Temperature Phase

Phototransformation products of the alkaloid lappaconitine: Multinuclear NMR study

2008 ◽  
Vol 197 (2-3) ◽  
pp. 290-294 ◽  
Author(s):  
Nikolay E. Polyakov ◽  
Tatyana V. Leshina ◽  
Alexey V. Tkachev ◽  
Irina A. Nikitina ◽  
Natalia A. Pankrushina
Keyword(s):  
Multinuclear Nmr ◽  
Nmr Study

Multinuclear NMR Study on the Sol–Gel Transition of Aqueous κ- and λ-carrageenan Solutions: Selective Site Binding of Group I Cations

2000 ◽  
Vol 39 (Part 1, No. 7A) ◽  
pp. 4094-4099
Author(s):  
Masahiko Annaka ◽  
Kiriko Suzuki ◽  
Ryoko Takahashi ◽  
Takayuki Nakahira ◽  
Masayuki Tokita ◽  
...  
Keyword(s):  
Sol Gel ◽  
Multinuclear Nmr ◽  
Nmr Study ◽  
Group I ◽  
Sol Gel Transition ◽  
Site Binding ◽  
Gel Transition

Conformational sampling of bioactive conformers: a low-temperature NMR study of15N-Leu–enkephalin

1998 ◽  
Vol 4 (4) ◽  
pp. 253-265 ◽  
Author(s):  
Pietro Amodeo ◽  
Fred Naider ◽  
Delia Picone ◽  
Teodorico Tancredi ◽  
Piero A. Temussi
Keyword(s):  
Low Temperature ◽  
Conformational Sampling ◽  
Nmr Study
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