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Electrochemical reduction of 2,4,6-trimethylbenzoyl chloride and 2,4,6-trimethylbenzaldehyde at carbon and mercury cathodes in acetonitrile

✍ Scribed by Greg A. Urove; Dennis G. Peters


Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
930 KB
Volume
39
Category
Article
ISSN
0013-4686

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✦ Synopsis


In acetonitrile containing tetraethyhunmonium perchlorate, cyclic voltammograms for the reduction of 2,4,6-trimethylbenxoyl chloride at glassy carbon and hanging mercury drop electrodes exhibit five and four cathodic waves, respectively. At potentials corresponding to the first wave, cleavage of the carbon-chlorine bond occurs to generate acyl radicals and anions that lead to the formation of 2,4, 6_trimethylbenzaldehyde, and the second wave is due to reduction of the aldehyde. Controlled-potential electrolyses of 2,4,6-trimethylbenzoyl chloride at a potential on the foot of the first wave produce 2,4,6trimethylbenxaldehyde and a tetrameric species, along with hydrolytically formed 2,4,6_trimethylbenzoic acid and 2,4,6&methylbenzoic anhydride. However, at a potential more negative than the peak potential for the first wave, co-reduction of some of the aldehyde takes place, yielding 2,4,6_trimethylbenxyl alcohol and 1,2-bis(2,4,6-trimethylphenyl~1,2-ethanediol, plus products that incorporate the solvent: 3-hydroxy-3-(2,4,6-trimethylphenyl)propionitrife, 3-(2,4,6-trimethylphenyl)acrylonitrile, 3-(2,4,6-trimethylphenyl)propionitrile, 3-(2,4,6&methylphenyl)ghttaronitrile, 2,3-bis(2,4,6-trimethylphenyl)-1,4-dicyanobutane, and lamino-2-cyano-3,~bi~~4,6-trimethylphenyi~yc~o~nt-l~ne. Separate cyclic voltammetric studies and controlled-potential electrolyses of 2,4,6-trimethylbenxaldehyde have confirmed these findings.


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