In the present work the results on synthesis and study of spectral properties are presented of the cyclopalladized complexes [Pd(C^N)En]ClO4 on the basis of oxazole and oxazoline derivatives [(C^N), deprotonated forms of 2-phenyl-2-oxazoline (pho), 2,5-diphenyloxazole (dpo), 2-(1-naphthyl)-5-phenyloxazole (npo), 2-phenylbenzoxazole (bo); En is 1,2diaminoethane]. The results of Н NMR (CD3CN) and IR (KBr) spectroscopy confirm the composition of complexes obtained in solution and in solid phase. The cyclopalladization leads not only to the deprotonation of phenyl and naphthyl substituents of oxazole and oxazoline ligands, but to the magnetic nonequivalence of amine protons of ethylenediamine due to the difference in the trans-effect of the donor atoms N and С of cyclometallated ligand. The IR spectra of complexes are characterized by both low-frequency shift of the stretching С=N vibrations of heterocyclic ligand and characteristic [4–6] change in the out-of-plane bending С–Н vibrations as a result of metallation of phenyl or naphthyl groups. DOI: 10.1134/S1070363210020337