Green synthesis of polycyclic benzimidazole derivatives and organic semiconductors
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.
Mamada, Masashi,Perez-Bolivar, Cesar,Anzenbacher, Pavel
supporting information; experimental part
p. 4882 - 4885
(2011/12/05)
NOVEL HETEROCYCLIC COMPOUNDS VIA AZA- AND BIS-AZA-WITTIG REACTIONS
Two quinoxaline derivatives, 1 and 2, were prepared via a bis-aza-Wittig reaction when the suitable aromatic diamine was treated with (MeO)3PBr2/Et3N followed by the addition of benzil.Also, two additional novel heterocyclic compounds, 4 and 6 were prepared via an intramolecular aza-Wittig reaction. Key words: Quinoxaline; bis-aza-Wittig; heterocycles.
Alkhathlan, Hamad Z.,Al-Lohedan, Hamad A.
p. 301 - 305
(2007/10/02)
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