Alkene insertion reactions of nitrogen-coordinated acylpalladium(II) complexes : the X-ray structure of the dicyclopentadiene insertion product [Pd(C20H23COMe)(bpy)]SO3CF3

Abstract

The new acylpalladium(II) complex [PdI(COMe)(bpy)] (2b, bpy = 2, 2'-bipyridyl) has been obtained by two routes; (i) by insertion of carbon monoxide into the Pd@?C bond of [PdIMe(bpy)] (1b), and (ii) by ligand exchange from [PdI(COMe)(tmeda)] (2a, tmeda = N,N,N',N'-tetramethylethanediamine). The cationic species obtained by reaction of 2a and 2b with AgOSO{2}CF{3} both undergo alkene insertions into the Pd@?C acyl bond that lead to remarkably stable products. The X-ray structure of the dicyclopentadiene insertion product [Pd(C{1}{0}H{1}{2}COMe)(bpy)]SO{3}CF{3} (4b) shows the oxygen atom of the carbonyl group to be coordinated to the metal center (Pd@?O = 2.026(3) @9).