By selective chemical reactions we mean reactions of a compound or polymer containing two different functional groups with a reagent which reacts only or predominantly with one of the said functional groups, leaving {TAIL ~ the other functional group} free to take {HEAD ~ part} in a subsequent chemical reaction 
By selective chemical reactions we mean reactions of a compound or polymer containing two different functional groups with a reagent which reacts only or predominantly with one of the said functional groups , leaving { TAIL ~ the other functional group } free to take { HEAD ~ part } in a subsequent chemical reaction
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 TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH