Cu(II) supported on crosslinked chitosan-cellulose beads as efficient and recyclable catalysts for oxidative self-coupling of amines to imines
1
Issued Date
2025-03-01
Resource Type
eISSN
26668939
Scopus ID
2-s2.0-85214014047
Journal Title
Carbohydrate Polymer Technologies and Applications
Volume
9
Rights Holder(s)
SCOPUS
Bibliographic Citation
Carbohydrate Polymer Technologies and Applications Vol.9 (2025)
Suggested Citation
Limprasart W., Sangkaworn J., Paosopa S., Pornsuwan S., Bunchuay T., Tantirungrotechai J. Cu(II) supported on crosslinked chitosan-cellulose beads as efficient and recyclable catalysts for oxidative self-coupling of amines to imines. Carbohydrate Polymer Technologies and Applications Vol.9 (2025). doi:10.1016/j.carpta.2024.100660 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/102770
Title
Cu(II) supported on crosslinked chitosan-cellulose beads as efficient and recyclable catalysts for oxidative self-coupling of amines to imines
Author's Affiliation
Corresponding Author(s)
Other Contributor(s)
Abstract
To address environmental and sustainability goals, catalytic processes must be efficient, economical, and practical. Chitosan-supported metal catalysts face challenges in mechanical strength and chemical stability, which can be improved by crosslinking and blending with cellulose. This study developed Cu(II) supported crosslinked chitosan-cellulose beads as a cost-effective and sustainable catalyst for green synthesis of imines, focusing on mechanical robustness to extend catalyst lifetime. The catalyst beads were prepared by mixing medium molecular weight chitosan and microcrystalline cellulose in HCl solution (2:1 w/w), crosslinking with 0.17 wt.% glyoxal, and depositing copper using 30 mM Cu(OAc)2 solution. The interactions between Cu(II) ions and the crosslinked chitosan-cellulose matrix were investigated. The Cu(II) species formed a stable square planar geometry, coordinating with oxygen and nitrogen donor atoms in the crosslinked matrix. The resulting structure combined the strength of cellulose with the chemical stability provided by glyoxal crosslinking, outperforming pure chitosan in mechanical strength and stability. The Cu/chitosan-cellulose beads catalyzed the oxidative self-coupling of amines to imines (14 examples), achieving yields of 45–97 % and retaining activity over 13 cycles with simple separation and recycling. Therefore, this Cu-based catalyst, with its robust structure and bead form, is a promising option for sustainable and efficient synthesis of imines.