Amikam Zoran

Reversible ion-pair extraction in a biphasic system. application in transition metal-catalyzed isomerization of allylic compounds

Abstract A two-liquid-phase catalysis is described in which aqueous metal halides of Group VIII are used for the isomerization of water-insoluble allylic compounds. With the aid of quaternary ammonium or phosphonium salts, the metal catalyst is extracted into the reagent-containing phase and returned to the aqueous layer by lipophilic anions upon completion of the catalytic process.

Catalytic hydrogenation of olefins, acetylenes and arenes by rhodium trichloride and aliquat-336 under phase transfer conditions

Abstract The ion pair formed from aqueous rhodium trichloride and aliquat-336 in dichloroethane catalyzes hydrogenation of a variety of unsaturated compounds. Aromatics are reduced to cyclohexane derivatives under exceedingly mild conditions.

Catalytic transfer hydrogenation of unsaturated compounds by solid sodium formate in the presence of palladium on carbon

Abstract Solid sodium formate is an efficient hydrogen donor for Pd/C-catalyzed transfer hydrogenation of olefins, acetylenes and nitro compounds in the presence of an equimolar amount of water at exceedingly mild conditions. The reaction proceeds mainly by a direct hydrogen transfer mechanism rather than via initial decomposition of the formate into molecular hydrogen and carbon dioxide.

Dichlorobis(triphenylphosphine)palladium(II)-promoted hydrogenolysis of aryl bromides by benzyl alcohol under phase transfer conditions

Abstract Aryl bromides are conveniently dehalogenated with benzyl alcohol and sodium hydroxide in a two-liquid phase system in the presence of a palladium-triphenylphosphine catalyst. Phase transfer catalysts have a significant effect on the efficiency of the hydrogenolysis.