Catalysis of surface dispersed Cu2+ species on t-ZrO2: square-planar Cu catalyzed cross-coupling of arylboronic acid and imidazole. Issue 7 (15th March 2023)

• Record Type: Journal Article
• Authors: Kondo, Masaru; Joutsuka, Tatsuya; Fujiwara, Kakeru; Honma, Tetsuo; Nishijima, Masahiko; Tada, Shohei
• Is Part Of: Catalysis science & technology. Volume 13:Issue 7(2023)
• Page Start: 2247
• Page End: 2254
• Publication Date: 2023-03-15
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/d3cy00024a
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : We examined the Chan–Lam cross-coupling of imidazole and arylboronic acids under additive-free and mild conditions using heterogeneous CuO/MO X catalysts such as metal oxide-supported CuO and Cu-doped metal oxides. Abstract : We examined the Chan–Lam cross-coupling of imidazole and arylboronic acids under additive-free and mild conditions using heterogeneous CuO/MO X catalysts such as metal oxide-supported CuO and Cu-doped metal oxides. Among them, CuO/t-ZrO2 exhibited the best performance, which was more than ten times the turnover number in comparison with that of bulk CuO. By combining experimental and computational approaches, we elucidated the surface structure of CuO/t-ZrO2 . The catalyst contained abundant highly reducible Cu 2+ species, in contrast to other Cu 2+ -containing catalysts. Notably, X-ray absorption spectroscopy and density functional theory calculations revealed that the Cu 2+ species are square-planar [CuO4 ]. Our results indicate that the highly active [CuO4 ] species play a key role in the present coupling reaction.