The preparation of catalytic nanocomposite hydrogels has been widely reviewed . Several examples showing their utility as nanoreactors for various reactions such as coupling, oxidation and reduction reactions have been reported . Wei et al. described a nanogel composed of poly(N-isopropylacrylamide) brushes grafted on Pd-NPs (Pd@PNIPAM) to carry out coupling reactions in water under mild conditions . They showed highly efficient coupling of several hydrophobic aryl halides with phenylboronic acid, which in all cases resulted in yields above 70%. Moreover, the Pd@PNIPAM nanoreactors could be easily recycled thanks to the reversible phase-transition of the polymeric brushes .