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- Title
Dehydrogenative Transformation of Alcoholic Substrates in Aqueous Media Catalyzed by an Iridium Complex Having a Functional Ligand with α-Hydroxypyridine and 4,5-Dihydro-1H-imidazol-2-yl Moieties.
- Authors
Masato Yoshida; Han Wang; Takuya Shimbayashi; Ken-ichi Fujita
- Abstract
A new catalytic system that employs water as an environmentally friendly solvent for the dehydrogenative oxidation of alcohols and lactonization of diols has been developed. In this catalytic system, a water-soluble dicationic iridium complex having a functional ligand that comprises α-hydroxypyridine and 4,5-dihydro-1H-imidazol-2-yl moieties exhibits high catalytic performance. For example, the catalytic dehydrogenative oxidation of 1-phenylethanol in the presence of 0.25 mol % of the iridium catalyst and base under reflux in water proceeded to give acetophenone in 92% yield. Additionally, under similar reaction conditions, the iridium-catalyzed dehydrogenative lactonization of 1,2-benzenedimethanol gave phthalide in 98% yield.
- Subjects
IRIDIUM catalysts; DEHYDROGENATION; KETONES
- Publication
Catalysts (2073-4344), 2018, Vol 8, Issue 8, p312
- ISSN
2073-4344
- Publication type
Article
- DOI
10.3390/catal8080312