Synthesis and immobilization of oxime-derived palladacycles as effective and reusable catalysts for the degradation of phosphorothionate pesticides

New oxime-derived palladacycles were prepared, spectral characterized, and immobilized on silica gel. Homogeneous catalysis indicates that pyridine coordinated oxime-derived palladacycles 1 and 2 were very effective in the methanolysis of fenitrothion, but suffered from the formation of the inactive dimmer at higher concentration. Immobilization of oxime-derived chloro-coordinated mononuclear and chloro-bridged dinuclear palladacycles afforded the high efficient and recoverable heterogeneous catalysts Si–Pd1 and Si–Pd2, both solid catalysts proved to be reusable in 10 runs and fascinated the degradation of a series of phosphorothionate pesticides up to 4.9 × 108 folds at sspH 8.8 and 25 °C.