LAUSR

In this paper, the synthesis of formamides via N-formylation of amines using magnetic lignosulfonate@4H-1,2,4-triazol-3-amine-copper complex (MLS-TA@Cu) catalyst is reported. The catalyst was prepared via immobilization of the Cu(II) complex on magnetic lignosulfonate (MLS). The catalyst structure was identified using various analyses such as XRD, FESEM, EDS, TEM, VSM, and FT-IR. The obtained catalyst showed excellent catalytic activity in the preparation of formamides in high yields in the absence of solvent. Moreover, MLS-TA@Cu can be reused consecutively without considerable loss of efficacy and simply separated using an external magnet, demonstrating high recyclability and great chemical stability. The remarkable advantages of this process are the operational simplicity, solvent-free nature, simple work-up procedure, and formation of pure products in high yields. The antibacterial activity of MLS-TA@Cu was tested on Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) bacteria.