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Updated: Jul 17, 2026

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
Published on: July 30, 2017
Two square-planar palladium(II) complexes with P,O-bidentate hybrid ligands
Mark R J Elsegood1, Martin B Smith, Sophie H Dale
1Chemistry Department, Loughborough University, Loughborough, Leicestershire LE11 3TU, England.
Abstract:
In the two square-planar palladium(II) complexes chloro[(diphenylphosphinoamino)diphenylphosphine oxide]methylpalladium(II) dimethyl sulfoxide solvate, [Pd(CH3)Cl(C24H21NOP2)].C2H6OS, (I), and chloro{[2-(diphenylphosphino)phenyl]diethoxymethane}methylpalladium(II), [Pd(CH3)Cl(C23H25O2P)], (II), a trans disposition of the diphenylphosphino and chloro groups is observed. The Pd atom in both complexes displays a distorted square-planar configuration formed by the four unique donor atoms (P, Cl, C and O). In compound (I), the five-membered Pd-P-N-P-O metallacycle is best described as having an envelope conformation, whereas in (II) the six-membered Pd-P-C-C-C-O metallacycle adopts a skewed boat conformation. Furthermore, within the P-N-P-O backbone in (I), the P-N distances are consistent with single-bond character [1.659 (3) and 1.692 (3) A], whilst the P=O bond shows appreciable double-bond character [1.509 (2) A].
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