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Highly magnetic carbon\u2010coated cobalt (Co\/C) and iron (Fe\/C) nanobeads were functionalized with a norbornene tag (Nb\u2010tag) through a \u201cclick\u201d reaction followed by surface activation employing Grubbs\u2010II catalyst and subsequent grafting of acylated <jats:italic>N<\/jats:italic>\u2010hydroxysuccinimide ROMPgels (ROMP=ring\u2010opening metathesis polymerization). The high loading (up to 2.6\u2005mmol\u2009g<jats:sup>\u22121<\/jats:sup>) hybrid material was applied in the acylation of various primary and secondary amines. The products were isolated in high yields (86\u201399%) and excellent purities (all &gt;95\u2009% by NMR spectroscopy) after rapid magnetic decantation and simple evaporation of the solvents. 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