Deuterium–protium fractionation in solutions of methoxide ion in mixtures of methanol and dimethyl sulphoxide

1982 ◽  
pp. 313-319 ◽  
Author(s):  
Lars Baltzer ◽  
Nils-Årke Bergman
Keyword(s):  
Dimethyl Sulphoxide ◽  
Methoxide Ion

Interaction of heterocycles and nucleophiles. II. Sigma complexes formed from methoxide ion and Methoxy-3,5-dinitropyridines in dimethyl sulphoxide

1970 ◽  
Vol 23 (5) ◽  
pp. 957 ◽  
Author(s):  
MEC Biffin ◽  
J Miller ◽  
AG Moritz ◽  
DB Paul
Keyword(s):  
Dimethyl Sulphoxide ◽  
No Conversion ◽  
Solvation Effects ◽  
Sigma Complexes ◽  
Sigma Complex ◽  
Methoxide Ion ◽  
Rearrangement Reactions

Contrasting behaviour is observed when 2- and 4-methoxy-3,5-dinitropyridine interact with methoxide ion in dimethyl sulphoxide. The 4-methoxy compound affords both methine and acetal sigma complexes, the latter being thermodynamically more stable. The interconversion is catalysed by methanol. Labelling experiments have established that the sigma complex from the 2-methoxypyridine is formed by addition at C6; no conversion into the acetal could be effected. These observations are rationalized in terms of differential steric and solvation effects. Demethylation and rearrangement reactions of 4-methoxy-3,5-dinitropyridine are reported.

σ-Complexes as biophysical and biochemical probes. Part II. Transformations of σ-complex intermediates from reaction of 4-nitrobenzofuroxan and methoxide ion

1977 ◽  
Vol 55 (15) ◽  
pp. 2852-2855 ◽  
Author(s):  
Erwin Buncel ◽  
Noemi Chuaqui-Offermanns ◽  
Brian K. Hunter ◽  
Albert R. Norris
Keyword(s):  
Reaction Mechanism ◽  
Dimethyl Sulphoxide ◽  
Antileukemic Activity ◽  
Methoxide Ion ◽  
Transient Intermediates

Reaction of 4-nitrobenzofuroxan with methoxide ion in methanolic dimethyl sulphoxide solution gives rise to 7-hydroxy-4-nitrobenzofurazan (as the anion) and 7-methoxy-4-nitrobenzofurazan (as the methoxide C-7 adduct); the proposed reaction mechanism invokes the formation of several transient intermediates. The results bear on the postulated mechanism for the antileukemic activity of 4-nitrobenzofuroxan.

scholarly journals Interaction of heterocycles and nucleophiles. III. Interconversion of the methine sigma complexes derived from 3,5-dinitropyridine and methoxide ion in dimethyl sulphoxide

1970 ◽  
Vol 23 (5) ◽  
pp. 963 ◽  
Author(s):  
MEC Biffin ◽  
J Miller ◽  
AG Moritz ◽  
DB Paul
Keyword(s):  
Dimethyl Sulphoxide ◽  
Stable Isomer ◽  
Sigma Complexes ◽  
Methoxide Ion

The conversion of the methine complex (4; R1 = H) into the more stable isomer (5; R1 = R2 = H) is reported.

scholarly journals The Influence of the Solvent on Reaction Velocity. XXXI. The Reaction between Benzyl Chlorides and Methoxide Ion in Dimethyl Sulphoxide-Methanol Mixtures.

1966 ◽  
Vol 20 ◽  
pp. 946-962 ◽  
Author(s):  
Eero Tommila ◽  
Matti Savolainen ◽  
Inkeri Lehtinen ◽  
Bengt von Hofsten ◽  
D. H. Williams ◽  
...  
Keyword(s):  
Dimethyl Sulphoxide ◽  
Reaction Velocity ◽  
Benzyl Chlorides ◽  
Methoxide Ion

Solvation of ions by dipolar aprotic solvents and water. A CNDO/2 study

1985 ◽  
Vol 50 (11) ◽  
pp. 2493-2508 ◽  
Author(s):  
Petr Kyselka ◽  
Zdeněk Havlas ◽  
Ivo Sláma
Keyword(s):  
Binary Mixtures ◽  
Quantum Chemical ◽  
Chemical Method ◽  
Molecular Structures ◽  
Dimethyl Sulphoxide ◽  
Ternary Mixtures ◽  
Aprotic Solvents ◽  
Quantum Chemical Method ◽  
Solvation Of Ions ◽  
Dipolar Aprotic Solvents

Solvation of Li+, Be2+, Na+, Mg2+, and Al3+ ions has been studied in binary mixtures with dimethyl sulphoxide, dimethylformamide, acetonitrile and water, and in ternary mixtures of the organic solvents with water. The CNDO/2 quantum chemical method was used to calculate the energies of solvation, molecular structures and charge distributions for the complexes acetonitrile...ion (1:1, 2:1, 4:1), dimethyl sulphoxide...ion (1:1), dimethylformamide...ion (1:1), and acetonitrile (dimethyl sulphoxide, dimethylformamide)...ion...water (1:1:1).

Viscosity, electrical conductivity and density of the system ammonium nitrate-dimethyl sulphoxide

1984 ◽  
Vol 49 (5) ◽  
pp. 1109-1115
Author(s):  
Jindřich Novák ◽  
Zdeněk Kodejš ◽  
Ivo Sláma
Keyword(s):  
Electrical Conductivity ◽  
Aqueous Solutions ◽  
Ammonium Nitrate ◽  
Transport Properties ◽  
Calcium Nitrate ◽  
Dimethyl Sulphoxide ◽  
Present System ◽  
Empirical Equations ◽  
Concentrated Solutions ◽  
Nitrate Solutions

The density, viscosity, and electrical conductivity of highly concentrated solutions of ammonium nitrate in dimethyl sulphoxide have been determined over the temperature range 10-60 °C and the concentration range 7-50 mol% of the salt. The variations in the quantities as a function of temperature and concentration have been correlated by empirical equations. A comparison is made between the transport properties for the present system, aqueous solutions of ammonium nitrate, and calcium nitrate solutions in dimethyl sulphoxide.

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