Second, recovering the metallated polymer in the active form allows {TAIL ~ concentration} thereof for {HEAD ~ further reaction} 
Second , recovering the metallated polymer in the active form allows { TAIL ~ concentration } thereof for { HEAD ~ further reaction }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD