Octahedral CsAgBiBr Double Perovskite Microcrystals for C-C Coupling Reactions under Visible-Light Irradiation.

In this report, we demonstrate the first application of lead-free double perovskite microcrystals (CsAgBiBr MCs) in sustainable C-C coupling reactions. The CsAgBiBr MCs catalyst exhibits ultrahigh activity and selectivity in the α-alkylation of aldehyde and 2-bromoacetophenone, achieving a reaction rate of 2687.5 mmolgh, a turnover number (TON) value of 22854.

Magnetic Hollowed CoFe Alloy@C Prism Catalyst for N-Alkylation of Alcohols and Amines.

A novel magnetic hollowed CoFe@C-650 prism catalyst has been successfully prepared and applied in the N-alkylation of alcohols and amines through a hydrogen borrowing strategy. The catalyst demonstrates good to excellent activities in the reaction with a broad substrate scope to afford up to a 99% yield of target products. A preliminary mechanistic study reveals that a high valent Co species in the catalyst may promote the adsorption and conversion of alcohols, while the Fe species assists in hydrogenating the imine intermediates.

Hollow CoFe Oxide Prisms for Cross-Dehydrogenative Coupling Reactions of 1,2,3,4-Tetrahydroisoquinolines under Mild Conditions.

A three-dimensional hollow CoFe oxide prism catalyst was successfully prepared via a self-template strategy. This bimetallic oxide catalyst demonstrated excellent catalytic activity in cross-dehydrogenative coupling reactions of 1,2,3,4-tetrahydroisoquinolines under mild conditions compared to its monometallic oxide counterparts. A preliminary mechanistic investigation showed the involvement of reactive oxygen species, produced from molecular O by the active bimetallic oxide catalyst in the catalytic cycle.