Journal ArticleDOI
Polarographic reduction of aldehydes and ketones. Part 6.—Behaviour of cinnamaldehyde at lower pH-values
D. Barnes,P. Zuman +1 more
TLDR
In this article, Cinnamaldehyde is reduced at the dropping mercury electrode in two main two-electron steps, in the first the CC double bond is reduced and in the second the aldehydic group.Abstract:
Cinnamaldehyde is reduced at the dropping mercury electrode in two main two-electron steps. In the first the CC double bond is reduced, in the second the aldehydic group. The rate of dehydration of 3-phenylpropionaldehyde governs the height of the more negative step. In acid media the first two-electron process is split into two one-electron steps. The radical formed in the first one-electron step can react with cations and the adduct formed gives a separate wave iN. In electrolyses with electrodes which do not have a periodically renewed surface (mercury pool and hanging mercury drop electrodes, single-sweep techniques) the radical formed undergoes further reactions and can eventually polymerize.read more
Citations
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Journal ArticleDOI
Dimerization, disproportionation and e.c.e. mechanisms in the reduction of aromatic carbonyl compounds in alkaline media
L. Nadjo,Jean-Michel Savéant +1 more
TL;DR: In this article, the reduction of several aromatic carbonyl compounds in ethanolic alkaline media has been investigated, and it is concluded that the dimerization mechanism is composed of a rate determining coupling between a neutral ketyl radical and an anion kyl radical, preceded by a fast and equilibrated protonation and eventually followed by neutralization of the pinacolate.
Journal ArticleDOI
Polarographic reduction of aldehydes and ketones
A. Ryvolová-Kejharová,Petr Zuman +1 more
TL;DR: In this article, the reduction of chalcone at the dropping mercury electrode is expressed by scheme (A)−(U) with an approximate value p K 6 =10.2 and p K 9 =8.75.
Journal ArticleDOI
Electrochemical reduction of metamitron
TL;DR: In this article, the potential of the first wave of metamitron is identical to that at which 2,3-dihydrometamitriou is reduced.
Journal ArticleDOI
Polarographic reduction of aldehydes and ketones
W. James Scott,P. Zuman +1 more
TL;DR: In this paper, the acid dissociation constant of the geminal diol of I was found to be 6.4 × 10-11 in 2% ethanol and 5 × 10 -12 in 40% ethanol.
Book ChapterDOI
Feasibility of polymer film coatings through electroinitiated polymerization in aqueous medium
TL;DR: In this article, the feasibility of polymeric coatings onto conductive substrates by electropolymerization as a new technique of metal protection is investigated, and the most promising routes for further investigation are outlined.
Related Papers (5)
Role of Keto-Enol Tautomerism in the Polarographical Reduction of Some Carbonyl Compounds
Petr Zuman,J. Michl +1 more