Determination of 3,4,5-Trihydroxybenzoic Acid Exploiting a Visible-Light-Driven Photoelectrochemical Platform: Application in Wine and Tea Samples

The present work is based on the development and application of a photoelectrochemical method for the amperometric determination of 3,4,5-trihydroxybenzoic acid in different samples. The method is based on the use of a photoelectrochemical platform based on a glass slide coated with fluorine-doped tin oxide, which has been modified with cadmium sulfide and poly(D-glucosamine) and subjected to a light-emitting diode (LED) lamp. The photoelectrochemical platform was sensitive to the increase of the concentration of the antioxidant 3,4,5-trihydroxybenzoic acid in the solution. Under the optimized experimental conditions, the photoelectrochemical method presented a linear response for a 3,4,5-trihydroxybenzoic acid concentration ranging from 0.2 up to 500 μmol L-1. The method was applied to 3,4,5-trihydroxybenzoic acid determination in samples of wines and teas with recoveries between 95.88 and 101.72%. The results obtained suggest that the developed platform is a promising tool for quantifying the 3,4,5-trihydroxybenzoic acid.

Organocatalyzed Photoelectrochemical C−H Amination of Arenes

Catalytic C–H/N–H cross-coupling is considered an ideal strategy for accessing anilines and derivatives, but its synthetic execution remains extremely challenging, especially when the exclusion of external oxidants is desired. Report herein is a photoelectrochemical method for the preparation of anilides through C–H/N–H coupling of arenes and carbamates, which employs DDQ as a molecular catalyst. The reactions are conducted in a simple undivided cell with visible-light irradiation and without any need for external chemical oxidants. In addition, the reactions employ arenes as the limiting agent, and are compatible with benzene and halogenated benzenes

Organocatalyzed Photoelectrochemical C−H Amination of Arenes

Catalytic C–H/N–H cross-coupling is considered an ideal strategy for accessing anilines and derivatives, but its synthetic execution remains extremely challenging, especially when the exclusion of external oxidants is desired. Report herein is a photoelectrochemical method for the preparation of anilides through C–H/N–H coupling of arenes and carbamates, which employs DDQ as a molecular catalyst. The reactions are conducted in a simple undivided cell with visible-light irradiation and without any need for external chemical oxidants. In addition, the reactions employ arenes as the limiting agent, and are compatible with benzene and halogenated benzenes