Ruthenium complexes of 1,3-bis(2-pyridylimino)isoindolines as alcohol oxidation catalysts
The ruthenium complex (1,3-bis(4-methyl-2-pyridylimino)isoindoline) trichlororuthenium III catalyzes the autoxidation and electrochemical oxidation of alcohols in basic solution. The reaction is general, resulting in the oxidation of primary and secondary alcohols, with the principal products being aldehydes and ketones. The catalytic autoxidation is affected by the strength of the base used and its coordinating ability. The best results were obtained with sodium ethoxide as a base. Turnover numbers of 10-30 per day were observed in 1 atm of oxygen at ambient temperature, with larger turnover numbers at higher temperature. More than 200 turnovers were observed in the oxidation of ethanol at the ambient temperature with little or no loss of catalytic activity. The catalyzed electrochemical oxidation was carried out in an alcoholic solution containing 2,6-lutidine with a carbon electrode at 0.8-1.0 V vs. NHE. In the absence of catalyst, negligible current was observed. More than 20 catalytic cycles were completed with the current remaining at 75% of its initial value. The ruthenium III complex exhibits reversible one-electron oxidation waves in non-alcoholic solvents in the presence or absence of 2,6-lutidine. Possible pathways for the catalytic autoxidation and electrochemical oxidation are presented.
- Research Organization:
- California Inst. of Tech., Pasadena
- OSTI ID:
- 6928331
- Journal Information:
- Inorg. Chem.; (United States), Vol. 23:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALCOHOLS
OXIDATION
RUTHENIUM COMPLEXES
CATALYTIC EFFECTS
AROMATICS
CATALYSIS
ELECTROCHEMISTRY
EXPERIMENTAL DATA
ORGANIC NITROGEN COMPOUNDS
CHEMICAL REACTIONS
CHEMISTRY
COMPLEXES
DATA
HYDROXY COMPOUNDS
INFORMATION
NUMERICAL DATA
ORGANIC COMPOUNDS
TRANSITION ELEMENT COMPLEXES
090210* - Alcohol Fuels- Properties- (1976-1989)