Catechol‐Functionalized Carbon Nanotubes as Support for Pd Nanoparticles: a Recyclable System for the Heck Reaction

Abstract Carbon nanotubes have been covalently functionalized with catechol moieties through the formation of corresponding aryl radicals obtained by reacting 4‐aminocatechol isoamyl nitrite. The multiwalled carbon in turn used to immobilize Pd(II) ions on its surface forming catechol‐Pd complexes, which were reduced Pd nanoparticles (NPs). so‐obtained hybrid material has characterized means thermogravimetric analysis coupled differential scanning calorimetry (TGA‐DSC), X‐ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). This latter technique allowed estimate nanoparticle size (5.7±2.8 nm) whereas a palladium loading 20.3 wt % found inductively plasma optical emission (ICP‐OES). nanotube‐catechol‐Pd was as catalyst two C−C coupling reactions, namely Suzuki Heck resulting recyclable for at least 9 times process. During reuse increase their dimension 19.3±11.7 nm.