A composition of matter having the general structure: ##STR1## (wherein X is F, Cl, or NO.sub.2, and Y is CO, SO.sub.2 or C(CF.sub.3).sub.2) is employed to terminate a nucleophilic reagent, resulting in the exclusive production of phenylethynyl terminated reactive oligomers which display unique thermal...http://www.google.de/patents/US5426234?utm_source=gb-gplus-sharePatent US5426234 - Phenylethynyl terminated reactive oligomer
