The synthesis of a soluble poly(para-phenylene) (PPP) derivative with two p-carboxyphenoxymethylene substituents in the 2,5-positions of every alternate phenylene moiety is described, transforming a bromomethylene-substituted precursor PPP in a two-step reaction sequence. Both of these steps, namely a Williamson reaction and an ester cleavage using anhydrous potassium hydroxide, occur selectively and almost quantitatively (>98%, n.m.r.). Structurally homogeneous, rigid-rod polyelectrolytes with 80-130 phenylene rings attached to each other may be obtained by this method.
Посилання на статтю:
Rigid-rod polyelectrolytes: carboxylated poly(para-phenylene)s via a novel precursor route / Iris Ursula Rau and Matthias Rehahn // Polymer. – 1993. – Vol 34. – P. 2889-2893.