Cu(II) immobilized on Fe$_{3}$O$_{4}$ @Agarose nanomagnetic catalyst functionalized with ethanolamine phosphate-salicylaldehyde Schiff base: a magnetically reusable nanocatalyst for preparation of 2-substituted imidazolines, oxazolines, and thiazolines

摘要

Herein we synthesized Cu(II) immobilized on Fe$_{3}$O$_{4}$ @Agarose functionalized with ethanolamine phosphate{salicylaldehyde Schiff base (Fe$_{3}$O$_{4}$ @Agarose/SAEPH$_{2}$ /Cu(II)) as a new and cost-effective nanomagnetic catalyst. Thenanomagnetic catalyst was characterized by FT-IR, XRD, VSM, SEM-EDX, TEM, TGA, and ICP techniques and itwas found that the particles were about 9-25 nm in size and spherical with entrapment of the Fe$_{3}$O$_{4}$ particles in thehollow pore structure of the agarose. The prepared nanomagnetic catalyst showed excellent activity for preparation of2-substituted imidazolines, oxazolines, and thiazolines. The catalyst is easy to prepare and exhibits higher catalyticactivity than some commercially available copper sources. More importantly, this nanomagnetic catalyst can be easilyrecovered by using a permanent magnet and reused for at least seven cycles without signicant deactivation.