Amorphous Porous Polyurethanes as Macromolecular Ligands for Palladium Catalysts

Masayoshi Bando, Wentao Zhu, Shuhei Shimoda, Eri Hamanishi, Natsuhiro Sano, Claudio Trombini, Naofumi Naga, Naoki Haraguchi, Shinichi Itsuno, Mayumi Nishida, Tamaki Nakano

研究成果: Article査読

抄録

Porous organic polymers (POPs) having urethane bonds were prepared through polyaddition of 4,4′-bis(hydroxylmethyl)-2,2′- bipyridyl with 1,3,5-triisocyanato-benzene and 1,3,5-tris(4-isocyanatophenyl) benzene, resulting in POP1 and POP2, respectively. The resulting POPs were complexed with Pd(OAc)2 to form POP-bound pre-catalysts, i.e., Pd(OAc)2@POP1 and Pd(OAc)2@POP2. Pd(II)@POP1 showed higher catalytic activities in Suzuki-Miyaura cross-coupling reactions compared with 2,2'-bipyridyl-Pd(OAc)2, as the reference "monomeric"catalyst. The higher catalytic activities of Pd(OAc)2@POP1 were interpreted in terms of the rigid framework of POP1.Within the POP1 framework, Pd may be more efficiently protected from agglomeration, which eventually leads to inactive palladium black formation. Unlike covalent organic frameworks (COFs) with crystalline structure, the present POPs are amorphous but capable, as polymeric ligands, of leading to active catalytic species.

本文言語English
ページ(範囲)5-9
ページ数5
ジャーナルChemistry Letters
52
1
DOI
出版ステータスPublished - 2023 1月

ASJC Scopus subject areas

  • 化学一般

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