A novel imidazolium ionic liquid-grafted 2,2′-bipyridine ligand has been prepared and successfully employed in the copper-catalyzed selective oxidation of alcohols to the corresponding carbonyl compounds in ionic liquid [bmim][PF6] under mild conditions, and the catalytic ionic liquid solution can be recovered and reused without significant loss of catalytic efficiency.
Polyquinolines containing diphenylphosphine ligands attached to an incorporated phenanthrene ring were prepared by the polymerization of the appropriate molar ratios of 4,4'-diamino-3,3/-dibenzoyldiphenyl ether, 4,4'-diacetyldiphenyl ether, and 3,6-diacetyl-9-(diphenylphosphino)phenanthrene or by the phosphination of the polyquinoline containing 9,10-dichlorophenanthrene units in the backbone with alkali diphenylphosphide. Hydroformylation reactions were carried out in the presence of these polyquinoline-supported catalysts.
A novel 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) radical bearing an ionic liquid-type appendage has been prepared, and its catalytic activity for the selective oxidation of alcohols to the corresponding carbonyl compounds in ionic liquid-aqueous biphasic conditions has been investigated. The ionic liquid-supported TEMPO radical shows catalyst properties similar to those of nonsupported counterpart in terms of activity and selectivity, and can be easily recycled and reused without loss of activity and selectivity.
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