Palladium(II)-Induced Activation of Carbon−Nitrogen Single Bond of Coordinated N4S Ligand. Characterization of Product with Modified Ligand Structure: Kinetics versus Thermodynamic Considerations

In methanol, the complexation reaction of palladium(II) with pentadentate N4S ligand having flexible pyrazolyl arms, appears to proceed through two parallel paths, one of which is thermodynamically controlled, generating product 1, while the other is kinetically driven to obtain product 2 in comparable yields. Structural anomeric effect plays a crucial role in the formation of 2.