Three additional advantages flow from the ease of separating {TAIL ~ excess metallating reagents} from {HEAD ~ the metallated crystalline polymer} 
Three additional advantages flow from the ease of separating { TAIL ~ excess metallating reagents } from { HEAD ~ the metallated crystalline polymer }
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD