title: Ultrasound assisted Bradsher reaction in aqueous and non-aqueous media: First use of ultrasounds in electrophilic aromatic cyclisation leading to polyacenes.
abstract: The present work describes the first use of ultrasounds in the Bradsher cyclisation of activated and non-activated ortho-formyl diarylmethanes. This reaction is also the first example of electrophilic, aromatic cyclisation assisted by ultrasounds which leads to pure polycyclic, fused aromatic hydrocarbons containing 3 and 4 fused rings in excellent yields. The reaction proceeds not only in aqueous but also in non-aqueous media at milder conditions (room temperature) and in much shorter reaction times than in conventional protocols.
authors: Group of Synthesis of Functional Materials, Department of Heteroorganic Chemistry, Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Łódź, Poland. Electronic address: kowalska@cbmm.lodz.pl.
authors: Emilia
authors: E
authors: Kowalska
authors: Group of Synthesis of Functional Materials, Department of Heteroorganic Chemistry, Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Łódź, Poland; Department of Structural and Material Research, Institute of Chemistry, Environmental Protection and Biotechnology, The Faculty of Mathematics and Natural Sciences, Jan Długosz University in Częstochowa, Armii Krajowej 13/15, 42-201 Częstochowa, Poland. Electronic address: pbalczew@cbmm.lodz.pl.
authors: Piotr
authors: P
authors: Bałczewski
keywords: Bradsher reaction; Cyclisation; Electrophilic aromatic substitution; Friedel-Crafts reaction; Polyacenes; Ultrasounds