The reactions between La3(OBu t )9(HOBu t )2 and various trimethylsilylamide species M[N(SiMe3)2] x (THF) y (M = K, Ba, Pb) have been investigated as a means to acceed to heterometallic La-M species. The La-K derivative was used as synthon in metathesis reaction toward CuCl2 in order to get an heterometallic La-Cu derivative. All compounds were characterized by elemental analysis, FT-IR, EPR and multinuclear NMR spectroscopies. Their hydrolyses at room temperature in THF led to nanocrystalline doped-lanthanum hydroxides. The as-prepared materials were characterized by elemental analysis, XRD and TEM. Their thermal behavior was studied by XRD and compared with that of yttrium derivatives.