{HEAD ~ Each metalated particle} thus prepared is {TAIL ~ a solid supported catalyst} that is stable for at least a month or more under pressure in a refrigerated environment and is useful for gas phase anionic polymerization of anionically polymerizable monomers to yield a macro branched polymeric product 
prepared is
{ HEAD ~ Each metalated particle } thus prepared is { TAIL ~ a solid supported catalyst } that is stable for at least a month or more under pressure in a refrigerated environment and is useful for gas phase anionic polymerization of anionically polymerizable monomers to yield a macro branched polymeric product
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH