Electrosyntheses based on reactions of addition of electrochemically generated radicals to ethylene and its derivatives—II. Mechanism of the reaction

✍ Scribed by Yu.B. Vassiliev; V.S. Bagotzky; E.P. Kovsman; V.A. Grinberg; L.S. Kanevsky; V.R. Polishchyuk

• Publisher: Elsevier Science
• Year: 1982
• Tongue: English
• Weight: 682 KB
• Volume: 27
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(82)80217-x

✦ Synopsis

Adsorption ofethylene and its derivatives on a platinum electrode is investigated. Twoadsorption regions are shown to exist: from 0 to 1.2 V-a region of adsorption (usually destructive) on pure platinum and from 1.5 to 3.0 V--a region of adsorption on the oxide layer. In the region of high anodic potentials, as well as for low ones, the dependence of surface coverage on the bulk concentration is described by Temkin's isotherm. Radicals R', formed due to discharge of adsorbed anions of carboxylic acids or monoesters, can be dimetired, disproportionate and react with solvent in the surface layer, yielding ordinary products of Kolbc and Brown-Walker synthesis, or they can react with an acceptor, yielding different products of addition. It is shown, using a ring-disk electrode that radicals R' react only in the surface layer and only with adsorbed ethylene. The acceptors are not directly involved in the electrode processes.