N. A. Alekseeva, V. V. Eremina, S. V. Sysolyatin, I. A. Shchurova
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Selective Catalytic Hydrodebromination of 2,3,4,5-Tetrabromothiophene with Hydrogen on a Palladium Catalyst
A way of hydrodebrominating 2,3,4,5-tetrabromothiophene (1) to 3,4-dibromothiophene (2) on a 5% Pd/Sibunit catalyst is proposed. The effect of solvent, alkaline agent, temperature, and concentration of 1 on the yield of 2 is studied. The optimum conditions are catalyst : substrate mass ratio, 1:10; temperature, 80°С; H2 pressure, 0.7 MPa; solvent, dimethylformamide; alkaline agent, triethylamine in amounts of 2.2 mol per 1 mol of substrate 1. The yield of 2 is 97.5% in this case. The catalyst can be reused in at least 15 cycles with high yields of 2. The new approach appears to be highly productive with little waste, compared to the conventional chemical reduction of 1 with zinc in CH3COOH.
期刊介绍：
The journal covers the following topical areas:
Analysis of specific industrial catalytic processes: Production and use of catalysts in branches of industry: chemical, petrochemical, oil-refining, pharmaceutical, organic synthesis, fuel-energetic industries, environment protection, biocatalysis; technology of industrial catalytic processes (generalization of practical experience, improvements, and modernization); technology of catalysts production, raw materials and equipment; control of catalysts quality; starting, reduction, passivation, discharge, storage of catalysts; catalytic reactors.Theoretical foundations of industrial catalysis and technologies: Research, studies, and concepts : search for and development of new catalysts and new types of supports, formation of active components, and mechanochemistry in catalysis; comprehensive studies of work-out catalysts and analysis of deactivation mechanisms; studies of the catalytic process at different scale levels (laboratory, pilot plant, industrial); kinetics of industrial and newly developed catalytic processes and development of kinetic models; nonlinear dynamics and nonlinear phenomena in catalysis: multiplicity of stationary states, stepwise changes in regimes, etc. Advances in catalysis: Catalysis and gas chemistry; catalysis and new energy technologies; biocatalysis; nanocatalysis; catalysis and new construction materials.History of the development of industrial catalysis.
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