84-44-6Relevant academic research and scientific papers
Higher Acenes by On-Surface Dehydrogenation: From Heptacene to Undecacene
Zuzak, Rafal,Dorel, Ruth,Kolmer, Marek,Szymonski, Marek,Godlewski, Szymon,Echavarren, Antonio M.
supporting information, p. 10500 - 10505 (2018/08/17)
A unified approach to the synthesis of the series of higher acenes up to previously unreported undecacene has been developed through the on-surface dehydrogenation of partially saturated precursors. These molecules could be converted into the parent acenes by both atomic manipulation with the tip of a scanning tunneling and atomic force microscope (STM/AFM) as well as by on-surface annealing. The structure of the generated acenes has been visualized by high-resolution non-contact AFM imaging and the evolution of the transport gap with the increase of the number of fused benzene rings has been determined on the basis of scanning tunneling spectroscopy (STS) measurements.
Organocatalyzed benzannulation for the construction of diverse anthraquinones and tetracenediones
Somai Magar, Krishna Bahadur,Xia, Likai,Lee, Yong Rok
supporting information, p. 8592 - 8595 (2015/05/20)
An efficient one-pot synthesis of anthraquinones and tetracenediones was achieved vial-proline catalyzed [4+2] cycloaddition of in situ generated azadiene from α,β-unsaturated aldehydes and 1,4-naphthoquinones or 1,4-anthracenedione in good to excellent yield. This protocol constitutes an unprecedented tandem benzannulation that allows one-pot construction of diverse anthraquinones and tetracenediones in the presence of organocatalysts. This methodology was applied successfully to the synthesis of naturally occurring molecules and photochemically interesting phenanthrenequinone derivatives.
