Reusable magnetic PdxCoy nanoalloys confined in mesoporous carbons for green Suzuki–Miyaura reactions. Issue 31 (10th May 2018)

• Record Type: Journal Article
• Authors: Enneiymy, Mohamed; Le Drian, Claude; Matei Ghimbeu, Camélia; Becht, Jean-Michel
• Is Part Of: RSC advances. Volume 8:Issue 31(2018)
• Page Start: 17176
• Page End: 17182
• Publication Date: 2018-05-10
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c8ra02214c
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : (Pd x –Co y )@MC were prepared in one-pot via an eco-friendly route and used many times for Suzuki reactions in H2 O or H2 O/EtOH mixture. Abstract : We report herein Pd x Co y nanoalloys confined in mesoporous carbons (Pd x –Co y @MC) prepared by an eco-friendly one-pot approach consisting in the co-assembly of readily available and non-toxic carbon precursors (phloroglucinol, glyoxal) with a porogen template (pluronic F-127) and metallic salts (H2 PdCl4 and Co(NO3 )2 ·6H2 O) followed by thermal annealing. Three Pd x Co y @MC materials with different alloy compositions were prepared (C1 : x / y = 90/10;C2 : x / y = 75/25;C3 andC4 : x / y = 50/50). The nanoalloys were uniformly distributed in the carbon framework and the particle sizes depended on the alloy composition. These composites were then used for Suzuki–Miyaura reactions using either H2 O or a 1 : 1 H2 O/EtOH mixture as solvent. The Pd50 Co50 @MC catalystC3 proved to be the most efficient catalyst (in terms of efficiency and magnetic recovery) affording the coupling products in good to excellent yields. After reaction, C3 was recovered quantitatively by simple magnetic separation and reused up to six times without loss of efficiency. The amount of palladium lost in the reaction mixture after magnetic separation was very low ( ca. 0.1 % wt of the amount initially used).