In this thesis, phosphorus ylides 4-phenyl benzoyl methylene triphenylphosphorane (PhBPPY) and 4-fluorobenzoyl methylene triphenylphosphorane (FBPPY) were synthesized through two steps involving the formation and depororotonation of phosphonium salt. Mononuclear complex [Ag(FBPPY) 2 ]OTf and orthopalladated dinuclear complex [Pd(µ-OAc)(PhBPPY)] 2 have been obtained respectively through the reaction of FY with silver (I) trifluoro methane sulfanate and PhBPPY with Pd(OAc) 2 . The dinuclear complex was reacted with aminoacids (phenylalanine, valine, leucine, iso- leucine and alanine) to obtain mononuclear complexes of general formula [Pd(aminoacid)(PhY)]. Synthesized complexes were identified and fully characterized by elemental analysis and spectroscopic studies (FT-IR and 1 H, 31 P-{ 1 H}, 13 C-{ 1 H}-NMR). Crystal structure of [Ag(FY) 2 ]OTf was confirmed through the X-ray analysis. The ?(CO) band appears at higher frequencies compared to that found in free ylide, indicative of C-coordination of ylide. ?(PC) is appeared at the lower frequencies due to the charge density reduction. 1 H NMR of all complexes show signals for ylidic-hydrogen in downfield chemical shifts in comparison with the free ylide confirming the C-coordination of ylide which reduces the charge density on the aromatic ring. Existence of two chiral center in each structure leads to the creation of four sets of peak for each hydrogen. 31 P-{ 1 H} NMR spectra of all complexes confirm four isomers for each complex. Computational studies were done by Gussion 09, DFT method, using LANL2MB basis set. It is consist of mulliken atomic charges, dipolmoments, HOMO/ LUMO energies and optimized structures of complexes. Considering the chairalaty of ylidic carbon, DFT calculation showed that the structure A in which carboxylate group is trans to the ylidic carbon, is more stable than B.
