A new methodology was developed employing biomass-derived 2,5-furandicarboxylic acid to produce 2,5-diaryl furans in good to excellent yields through palladium-catalyzed double decarboxylative cross-couplings. Various aryl halides were successfully evaluated as coupling partners. The present work contributes to the development of useful methodologies employing biomass-derived starting materials for the chemical synthesis industry.
Impedance is an important parameter used to characterize electronic circuits, components, and the materials used to make components. Impedance (Z) is generally defined as the total opposition a device or circuit offers to the flow of an alternating current (AC) at a given frequency. A fast and wide - range balanced theory of the method is designed. In a implementation , an impedance component is based on a GIC ( General immittance converter ) system. Which provides a variable impedance. The principle of this method is comprehensive and its implementation is simple. As a digital measurement technique, the method takes full advantage of the powerful arithmetic and processing ability of a microprocessor.
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