Catalytic transfer hydrogenation (CTH) of different homo- or
heteronuclear organic compounds was performed in a room temperature
ionic liquid (RTIL) N-butyl-N′-methylimidazolium hexafluorophosphate,
([BMIM]+ [PF6]-)
(1) as solvent heated by microwave irridiation.
Formate salts such as ammonium formate and triethylammonium formate
were used as a hydrogen source in the reaction catalyzed by palladium
on carbon. Essentially pure products could be isolated in moderate
to excellent yields by simple liquid-liquid extraction with methyl tert-butyl ether (MTBE). Recycling of
the catalyst/solvent system was possible.
microwaves - room temperature ionic liquid - catalytic transfer
hydrogenation - unsaturated compounds - formate
salts
