Volume 129, Issue 5 pp. 1381-1384
Zuschrift

One-Step Annulative π-Extension of Alkynes with Dibenzosiloles or Dibenzogermoles by Palladium/o-chloranil Catalysis

Dr. Kyohei Ozaki

Dr. Kyohei Ozaki

Graduate School of Science, Nagoya University, Chikusa, Nagoya, 464-8602 Japan

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Keiichiro Murai

Keiichiro Murai

Graduate School of Science, Nagoya University, Chikusa, Nagoya, 464-8602 Japan

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Wataru Matsuoka

Wataru Matsuoka

Graduate School of Science, Nagoya University, Chikusa, Nagoya, 464-8602 Japan

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Dr. Katsuaki Kawasumi

Dr. Katsuaki Kawasumi

Graduate School of Science, Nagoya University, Chikusa, Nagoya, 464-8602 Japan

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Dr. Hideto Ito

Corresponding Author

Dr. Hideto Ito

Graduate School of Science, Nagoya University, Chikusa, Nagoya, 464-8602 Japan

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Prof. Dr. Kenichiro Itami

Corresponding Author

Prof. Dr. Kenichiro Itami

Graduate School of Science, Nagoya University, Chikusa, Nagoya, 464-8602 Japan

Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Chikusa, Nagoya, 464-8601 Japan

JST-ERATO, Itami Molecular Nanocarbon Project, Nagoya University, Chikusa, Nagoya, 464-8602 Japan

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First published: 21 December 2016
Citations: 19

Abstract

Reliable and short synthetic routes to polycyclic aromatic hydrocarbons and nanographenes are important in materials science. Herein, we report an efficient one-step annulative π-extension reaction of alkynes that provides access to diarylphenanthrenes and related nanographene precursors. In the presence of a cationic palladium/o-chloranil catalyst system and dibenzosiloles or dibenzogermoles as π-extending agents, a variety of diarylacetylenes are transformed successfully into 9,10-diarylphenanthrenes in a single step with good functional-group tolerance. Furthermore, double π-extension reactions of 1,4-bis(phenylethynyl)benzene and diphenyl-1,3-butadiyne are demonstrated, affording oligoarylene products, which show potential for application in the synthesis of larger polycyclic aromatic hydrocarbons and nanographenes.

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