Macrocyclic Metal Complexes Bearing Rigid Polyaromatic Ligands: Synthesis and Catalytic Activity

Koji Yamamoto; Kazuki Higuchi; Masahiro Ogawa; Hiromitsu Sogawa; Shigeki Kuwata; Yoshihiro Hayashi; Susumu Kawauchi; Toshikazu Takata

doi:10.1002/asia.201901561

Macrocyclic Metal Complexes Bearing Rigid Polyaromatic Ligands: Synthesis and Catalytic Activity

Chem Asian J. 2020 Feb 3;15(3):356-359. doi: 10.1002/asia.201901561. Epub 2019 Dec 30.

Authors

Koji Yamamoto^{1

2}, Kazuki Higuchi¹, Masahiro Ogawa¹, Hiromitsu Sogawa^{1

3}, Shigeki Kuwata⁴, Yoshihiro Hayashi⁴, Susumu Kawauchi⁴, Toshikazu Takata¹

Affiliations

¹ Department of Chemical Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan.
² Present address: Division of Molecular Science, Faculty of Science and Technology, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma, 376-8515, Japan.
³ Present address: Biomacromolecules Research Team, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
⁴ Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo, 152-8552, Japan.

PMID: 31823483
DOI: 10.1002/asia.201901561

Abstract

We synthesised palladium and platinum complexes possessing cyclic and acyclic pincer-type polyaromatic ligands and investigated their structural effect on the catalysis. The pincer-type bis(6-arylpyridin-2-yl)benzene skeleton was constructed via Kröhnke pyridine synthesis under transition metal-free conditions on gram-scale quantity. Ligand structure significantly influenced catalytic activity toward the platinum-catalysed hydrosilylation of diphenyl acetylenes, despite the ligand-independence of the conformations and electronic properties of these complexes.

Keywords: hydrosilylation; macrocyclic ligands; polyaromatic ligands; topology; transition metals.

Abstract

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