Self-assembled nanoreactors are macromolecular architectures that are non-covalently assembled from their constituent building units [58–59]. Such nanoreactors allow for physical confinement of catalysts, shielding them from their surroundings . Compartmentalization of catalysts in supramolecular nanoreactors is advantageous from kinetic (faster catalytic process)  and thermodynamic (lower transition state of reaction)  catalysis points of view. Segregation and isolation of catalysts inside nanoreactors guarantee, in most cases, a valuable platform for catalyst recycling . In the following section we will discuss the utility of some of the well-established catalytic nanoreactors towards green(er) chemistry .