Extended benzodifuran–thiophene systems connected with azomethine junctions: synthesis and electronic properties
摘要:
The synthesis of extended benzodifuran-thiophene systems connected by azomethine junctions is described. The electronic properties of these systems, studied by UV-vis spectroscopy and cyclic voltammetry, are discussed in relation with the electron withdrawing groups grafted on the benzodifuran unit and the electron donor ability of the thiophene moieties. (C) 2015 Elsevier Ltd. All rights reserved.
Electro-Organic Synthesis of 2-Amino-3-cyano-benzofuran Derivatives Using Hydroquinones and Malononitrile
摘要:
[image omitted] In this work, electrochemical oxidation of hydroquinones has been studied in the presence of malononitrile as a nucleophile in aqueous solution using cyclic voltammetry and controlled potential coulometry. The results indicate that the quinones derived from hydroquinones participate in Michael addition and then intramolecular nucleophilic addition to yield benzofuran derivatives. The electrochemical synthesis of these new 2-amino-3-cyano-benzofuran derivatives has been performed successfully at a carbon-rod electrode in an undivided cell in good to excellent yields at room temperature.