The reaction of pyridine, quinoline, and thiophene with lanthanide metals (Nd, Gd) at 20 degreesC under mechanical activation conditions was studied. It was found that the aromatic ring opening takes place in all cases, yielding linear polyconjugated polymers. IR spectroscopy data suggest that the nitrogen-containing cycle alone undergoes ring opening in the quinoline molecule. According to the elemental analysis data, the polymer produced from thiophene has a lower sulfur content, thus indicating the occurrence of desulfurization of the polymer or the thiophene itself by the action of an activated metal. Another pathway of the reaction between heteroaromatic compounds and lanthanides is the metal insertion into the C-H bond, yielding organolanthanum hydride.