Abstract Four tridentate thiosemicarbazone salicylaldiminato-palladium (II) complexes of the general formula [Pd (saltsc-R) PPh 3][saltsc= salicylaldehyde thiosemicarbazone; R= H (1), 3-tert-butyl (2), 3-methoxy (3), 5-chloro (4)], have been evaluated as catalyst precursors for the Mizoroki–Heck coupling reaction between a variety of electron-rich and electron-poor aryl halides and olefins. The palladium complexes (0.1–1 mol% loading) were found to ...