1: In cat. terms, g. is a proc. of equil. *adsorption of an active cat. species (metal or *precursor) by covalent bonding to a solid *support from a solution in which the support is suspended (e.g., cats. for sequential *Knoevenagel reaction/*Mislow-Evans rearrangements). Thus, *supported cats. are manuf. (*immobilization; cf. also *impregnation). Grafting of Pd *colloids on *mesoporous *silica proceeds via an intermediate layer of trimethoxysilane which is reduced and forms isolated *islands both on the inner and outer *surfaces. G. by means of organometallic cpds. is called *organometallic grafting. 2: Graft polymers → copolymers. In polymer science, g. means the growth of polymers from monomeric cpds. on preformed polymers which initiate further growth because of the presence of cat. The *polymerization can also be initiated by *ring-opening metathesis polymerization (ROMP); the cat. may be covalently attached to surfaces via anchors and *spacers (*tethers). This technique, called “*grafting-from” (Figure), may be important for the adhesion of fibers and competes with *contact metathesis polymerization.