Fabrication of a novel graphene oxide based magnetic nanocomposite and its usage as a highly effectual catalyst for the construction of N,N'-alkylidene bisamides

At first, a novel graphene oxide-based magnetic nanocomposite namely Si-propyl-functionalized N 1,N 1,N 2,N 2-tetramethylethylenediamine-N 1,N 2-diium hydrogen sulfate anchored to graphene oxide-supported Fe3O4 (nano-[GO@Fe3O4@R-NHMe2][HSO4]) was fabricated. After full characterization of the nanocomposite, its catalytic performance was examined for the solvent-free construction of N,N'-alkylidene bisamides from aryl aldehydes (1 eq.) and primary aromatic and aliphatic amides (2 eq.), in which the products were acquired in short times (15-30 min) and high to excellent yields (89-98%). Nano-[GO@Fe3O4@R-NHMe2][HSO4] could be magnetically isolated form the reaction medium, and reused three times without remarkable loss of catalytic activity.