期刊
CHEMCATCHEM
卷 13, 期 5, 页码 1311-1316出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.202001841
关键词
Pauson-Khand; Mesoporous cobalt; Cobalt nanoparticles; Gold catalyst; Alkali ion-promoters
资金
- TWAS-NRF [116088]
Surface-active and highly stable cobalt nanoparticles generated from an alkali ion-promoted gold catalyst were used for catalyzed carbonylative [2+2+1] cyclization reaction, achieving up to 93% yield of cyclopentenone adducts. The presence of alkali ion-promoters in the catalyst increased surface basicity and facilitated the reduction of robust mesoporous cobalt oxide to metallic cobalt, thus enhancing the catalyst activity under milder reaction conditions. Ultimately, a sustainable, highly reusable, and environmentally friendly green catalyst for carbonylation reactions was successfully developed.
Surface-active and highly stable cobalt nanoparticles generated from alkali ion-promoted gold catalyst for catalyzed carbonylative [2+2+1] cyclization reaction, is described. The gold nanoparticle's (AuNPs) role was assumed to dissociate the CO and H-2 into atomic species on the catalyst surface by spillover, which in-situ reduces the robust mesoporous cobalt oxide to metallic cobalt (Co3+-> Co2+-> Co), as the active catalytic species that catalyzed the reaction; thereby providing up to 93 % yield of cyclopentenone adducts. Prior to this, catalyst pre-treatment with H-2 gas (130 degrees C, 3 h, 20 atm) was performed to reduce the catalyst. It appeared that the low reducibility temperature and increased surface basicity ascribed to the presence of alkali ion-promoters in the catalyst revealed a strong correlation with the catalyst activity, for the intra- and intermolecular reactions under milder reaction conditions. Thus, a sustainable, highly reusable, and environmentally friendly green catalyst for the carbonylation reaction, such as Pauson-Khand, was developed.
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