THE position of alkynes in the trans-effect series for platinum(r1) complexes has not been reported, nor have the relative positions of substituted phosphines, arsines, and stibines been established.We report the results of kinetic studies of diethylamine exchange reactions at 25" in complexes of the type tran~-l,PtCl,[~~C]NHEt~ (I, = ligand) in methanol (Figure l), n-hexane (Figure Z), and benzene. The reaction products have been shown by spectra to be identical with the starting material.The order of decreasing trans-effect for various ligands 'L' is now established as follows :
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