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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
Green synthesis of polycyclic benzimidazole derivatives and organic semiconductors
Masashi Mamada1, César Pérez-Bolívar, Pavel Anzenbacher
1Department of Chemistry, Bowling Green State University, Bowling Green, Ohio 43403, USA.
Abstract:
Polycyclic benzimidazole derivatives, an important class of compounds in organic electronics and photovoltaics, were prepared using a solvent-free "green" process based on heating carboxylic acid anhydrides and arylene diamines in the presence of zinc acetate in the solid state. Products were isolated and purified directly by train sublimation of the crude reaction mixtures. The reaction conditions were optimized using various carboxylic acid anhydrides. Optical and electrochemical properties of these materials are also described.
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