2-Hydroxyethyl-Substituted (NHC)Pd(II)PPh3 Complexes: Synthesis, Characterization, Crystal Structure and Its Application on Sonogashira Cross-Coupling Reactions in Aqueous Media

This study contains the synthesis of the novel series of the 2- hydroxyethyl substituted Pd-based N-heterocyclic carbene (NHC) / triphenylphosphine (PPh3) complexes. The (NHC)Pd(II)PPh3 complexes have been prepared from the PPh3 ligand, replaced by 3-chloro pyridine ligand in (NHC)Pd(II)(3-Cl-pyridine) complexes. The novel 2-hydroxyethyl substituted (NHC)Pd(II)PPh3 complexes have been characterized by using (HNMR)-H-1, C-13 {H-1}NMR, P-31 {H-1}NMR, FTIR spectroscopy, and elemental analysis techniques. Molecular and crystal structure of 1f was obtained by using single-crystal X-ray diffraction method. The novel 2-hydroxyethyl substituted (NHC)Pd(II)PPh3 complexes have been examined as catalysts in the Sonogashira cross-coupling reactions aqueous medium and demonstrated excellent activity in this reaction.