화학공학소재연구정보센터
Catalysis Letters, Vol.144, No.9, 1573-1583, 2014
Design, Synthesis and Characterization of Bimetallic Palladium Complexes for Terminal Olefin Epoxidation
A series of aromatic ring spaced binuclear Pd(II) complexes were synthesized from sterically tuned Schiff base ligands derived from 4,6-diacetylresorcinol and 2,6-dialkyl substituted anilines to provide a general and flexible set of complexes for terminal olefin epoxidation studies using "green" oxidant 30 % hydrogen peroxide as a terminal oxidant. All the compounds were fully characterized by analytical and spectrometric methods. Additionally, the ligands L1 and L2 were characterized by single crystal X-ray diffraction technique. The complexes C1 and C2 displayed high activity and substrate selectivity in the oxidation of 1-octene, whereas mixed products were observed in case of styrene with reasonable yields, arguably assignable to stringent steric and electronic factors of the complexes employed. Up to 98.5 % conversion is observed for epoxidation of 1-octene with high substrate selectivity, whereas up to 95 % conversion is observed for styrene with poor selectivity. A series of Pd(II) complexes were synthesized from sterically tuned Schiff base ligands derived from 4,6-diacetylresorcinol and 2,6-dialkyl substituted anilines to provide a flexible set of complexes for olefin epoxidation studies using hydrogen peroxide as a terminal oxidant. The complexes C1-C3 showed substrate selectivity in the oxidation of 1-octene, where as mixed products were observed in case of styrene with reasonable yields.