Mechanism of electrochemical oxidation of catechol and 3-substituted catechols in the presence of barbituric acid derivatives. Synthesis of new dispiropyrimidine derivatives

Electrochemical oxidation of catechols in the presence of acetylacetone

“…The present results complete the previous reports on the anodic oxidation of some catechols [5][6][7][8][9][10][11][12][13]. The results of this work show that catechols are oxidized in water to their respective o-quinones.…”

“…Previously we have shown that catechols can be oxidized electrochemically to o-quinones. The quinones formed are quite reactive and can be attacked by a variety of nucleophiles such as: 4-hydroxycoumarin [5,6], 4-hydroxy-6-methyl-2-pyrone [7], barbituric acids [8][9][10][11], benzensulfinic acid [12,13] and were converted to the corresponding coumestan [5][6][7], pyrimidine [8][9][10][11] and sulfone [12,13] derivatives, respectively. The importance of benzofurans has caused us to synthesize a number of these compounds.…”

Electrochemical detection and quantification of gingerol species in ginger (Zingiber officinale) using multiwalled carbon nanotube modified electrodes

“…This process is shown in the voltammograms as peaks II and II′. 31,32 The proposed mechanism is illustrated and summarised in Scheme 1. The above electrochemical results closely mirror those found for the electrooxidation of capsaicin.…”

Mechanistic study of homogeneous reactions coupled with electrochemical oxidation of catechols

“…The electrochemical synthesis of products has been successfully performed in an undivided cell in good yield and purity. The reaction mechanism for the anodic oxidation of catechols (1) in the presence of nucleophiles (87) is presented in Scheme 26 [98,99].…”