ISSN:
1572-8838
Keywords:
organic electrosynthesis
;
p-methoxybenzaldehyde
;
p-methoxytoluene
;
cobalt manganese spinel
;
titanium composite anodes
;
heterogeneous redoxcatalysis
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Electrical Engineering, Measurement and Control Technology
Notes:
Abstract Activated titanium anodes with a spinel coating of CoMn2O4 of about 1μm thickness were developed. A relative stability in acid electrolytes was found. The novel anode was employed for the anodic oxidation of p-methoxytoluene (PMT) to p-methoxybenzaldehyde (PMB), which is of industrial interest. Batch type electrolyses with 30% theoretical conversion (4Fmol−1) were used for␣a parametric screening. The solvent/electrolyte-system was 1m H2SO4/5m H2O in methanol. Optimum results (60% selectivity, 50–60% current efficiency) were obtained at low concentrations of the educt (0.2m). A part of the current is consumed for the formation of the benzylmethylether, which can be further oxidized to PMB. It was proved that the novel anode operates according to the mechanism of heterogeneous redox catalysis with ter- and heptavalent manganese as the redox species. A turnover factor of 〉2000 is unusual for a spinel in acid solution.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1003416421327
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