Reduction electrochimique a l'electrode de mercure de composes α-hydroxycarbonyles en solution aqueuse α — I. Glyoxals RCOCH(OH)<sub>2</sub>期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Reduction electrochimique a l'electrode de mercure de composes α-hydroxycarbonyles en solution aqueuse α — I. Glyoxals RCOCH(OH)₂

Authors:	S Letellier J.C Dufresne M.B Fleurry

Affiliation:	1. Laboratoire de Chimie Analytique, Faculté de Sciences Pharmaceutiques et Biologiques, Université Paris V, 4, avenue de l''Observatoire, 75270 Paris Cédex 06, France;2. Laboratoire de Chimie-Physique Organique, Faculté des Sciences et Techniques de Rouen, 76130 Mont Saint Aignan, France

Abstract:	Reduction at the mercury electrode in aqueous solution of the unhydrated form of glyoxals exhibits evidence of a reversible system: RCOCHO + 2e + 2H⁺ ?har2; RC(OH)CHOH with RCH₃ or C₆H₅.For the hydrated form C₆H₅COCH(OH)₂, investigation indicated occurrence of two types of irreversible processes. In neutral media transfer of two electrons involve either the hydrogenolysis of the COH bond, yielding hydroxyacétophenone: C₆H₅COCH₂OH, or alternatively the reduction of the keto grouping yielding mandelaldehyde: C₆H₅CHOHCHO.The COH cleavage is exclusive in acidic media and for aliphatic glyoxals RCOCH(OH)₂.

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