Infrared spectra of Cs- and Li-ion-exchanged cabosils have been measured after various treatments such as evacuation at 25–400 °C and exposure to D 2O or 2-bromobutane, to elucidate the mechanism of anti elimination. Hydroxyl stretching bands of cabosil became weaker by the alkali-ion-...
Solvent Incorporation in Bromination of Acetylenes in Alcohols The reactions of acetylenes with bromine in alcohols at 20–25 °C afford dibromodialkoxyalkanes in good yields together with variable amounts of dibromoalkenes. Similar treatment of phenylacetylene with copper(II) bromide gives only bro....
This is the first report of aerobic oxidative bromination using only catalytic amount of metal-free catalyst. This system shows not only high bromine atom economy, but also high bromination selectivity. The possible mechanism and the role of the catalyst in this system have also been discussed....
The reaction rates via anti mode increased in proportion to the number of Cs ions loaded on silica. Basic sites responsible for anti elimination are likely the oxide ions associated with electron-donating Cs ion. A possible mechanism of anti elimination, which does not necessitate any particular ...
Polar radicals. XI. Kinetic studies on the mechanism of the liquid phase bromination of 1-chlorobutaneA general method for the evaluation of the kinetics of the solution phase bromination of alkanes and substituted alkanes is presented. The model used considers reversible transfer reactions of the ...
BROMOALKANESLEWIS ACID CATALYSTSION-PAIR MECHANISMThe participation of ion-paired Lewis acid/Lewis base in the dehydrohalogenations of 1,2-dibromo-1,1-diarylalkanes catalyzed by Fe-0 and by Fe(II) and Fe(III) bromides was investigated. The reactivities of the catalyst employed were correlated ...
Super Acid Catalyzed Bromination of IsoalkanesIsoalkanes are brominated by Br2 in liquid SO2 in the presence of catalytic amounts of super acids (SbF3 or SbF5 – HSO3F (1:1 molar ratio – "Magic Acid")) to yield mono, di and tri bromoalkanes. A possible mechanism is discussed....
On Pd and Pt hydrogenolysis with the formation of highly deuterated alkanes occurs, while on Ni, olefins as well as deuterated alkanes are observed. We conclude that the same basic mechanism is operative on all the catalysts and that variations in the relative rates of the several steps in ...