Cyclohexadienone ketals and quinols: four building blocks potentially useful for enantioselective synthesis.

Electrochemical Reaction Dynamics - A Review

Propargylamines are a versatile class of compounds which find broad application in many fields of chemistry. This review aims to describe the different strategies developed so far for the synthesis of propargylamines and their derivatives as well as to highlight their reactivity and use as building blocks in the synthesis of chemically relevant organic compounds. In the first part of the review, the different synthetic approaches to synthesize propargylamines, such as A3 couplings and C–H functionalization of alkynes, have been described and organized on the basis of the catalysts employed in the syntheses. Both racemic and enantioselective approaches have been reported. In the second part, an overview of the transformations of propargylamines into heterocyclic compounds such as pyrroles, pyridines, thiazoles, and oxazoles, as well as other relevant organic derivatives, is presented.

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Synthesis and Reactivity of Propargylamines in Organic Chemistry

Mechanism of inhibition of electrode reactions at high surface coverages - II

Synthesis of 3-pyrrolines, annulated 3-pyrrolines, and pyrroles from alpha-amino allenes.

Anodic oxidation of aryl propargyl and aryl allyl ethers at a platinum electrode

Polarography of 4-nitrodiphenylamine (DPA) in methanol-water mixtures⋆

The electrochemical reduction of 2,3′-dinitrobenzidine (I) has been investigated in N,N-dimethylformamide solutions. Three diffusion-controlled polarographic waves were obtained. The first wave is due to a reversible single electron-transfer while the second and third waves result from irreversible processes involving one and two electron-transfers, respectively. The radical anion formed in the first step of reduction was confirmed by ESR technique. The red colour compound formed due to “ion association” after the second electron-transfer step gives rise to a polarographic “minimum” and a “dip” in the chronopotentiogram in addition to the new “peak clusters” seen in cyclic voltammograms. A mechanism is suggested for the reduction of I leading to the formation of 2,3′-dinitrosobenzidine.

C. S. Venkatachalam

Papers

Anodic oxidation of aryl propargyl and aryl allyl ethers at a platinum electrode

Polarography of 4-nitrodiphenylamine (DPA) in methanol-water mixtures⋆

Electrochemical Behaviour of 2,3′-Dinitrobenzidine in N,N-Dimethylformamide

Electrochemical reduction of 4-thienylquinazoline in dimethylformamide*

Novel electrochemical route to 2-(α-alkoxyallyl)phenols - cathodic eliminative ring opening reaction