Kinetic Study of Electrochemically Induced Michael Reactions of <i>o</i>-Quinones with Meldrum’s Acid Derivatives. Synthesis of Highly Oxygenated Catechols
作者:D. Nematollahi、H. Shayani-jam
DOI:10.1021/jo800115n
日期:2008.5.1
Electrochemical oxidation of catechols has been studied in the presence of Meldrum’s acid derivatives as nucleophiles in aqueous solution, by means of cyclic voltammetry and controlled-potential coulometry. Catechols in the Michael addition reaction react with Meldrum’s acids to form adducts that can undergo electrooxidation. Such products were obtained in good yields as confirmed by controlled potential
Kinetics of the oxidation of ascorbic acid and substituted 1,2- and 1,4-dihydroxybenzenes by the hexacyanoruthenate(III) ion in acidic perchlorate media
作者:J. Mark A. Hoddenbagh、Donal H. Macartney
DOI:10.1039/dt9900000615
日期:——
The kinetics of oxidation of ascorbicacid and a series of substituted1,2- and 1,4-dihydroxybenzene compounds (H2Q) by [Ru(CN)6]3– have been investigated in acidicperchloratemedia. The inverse dependences of the rate constants on acid concentrations for 2,3-dicyano-1,4-dihydroxybenzene, 4,5-dihydroxybenzene-1,3-disulphonate, and ascorbicacid have been attributed to concurrent rate-determining pathways
Isochromanone is the core structure of many active natural products. The synthesis of this scaffold is generally achieved by metal catalysis that needs specifically functionalized substrates or harsh conditions. Herein, we disclose the first oxidative [4 + 2] cyclization of pyrocatechuic acid with various substituted styrenes by using the cell lysate of multicopper oxidase (MCO) Mnx, previously known