Issue 20, 2024

Synthesis and catalytic properties of palladium(ii) complexes with P,π-chelating ferrocene phosphinoallyl ligands and their non-tethered analogues

Abstract

Hybrid phosphines usually combine a phosphine moiety with another heteroatom secondary donor group in their structures while compounds equipped with hydrocarbyl π–donor moieties remain uncommon. This contribution reports the synthesis and structural characterization of the first P/π-allyl-chelating complexes that were obtained using the structurally flexible and redox-active ferrocene unit as the scaffold, viz. [PdCl(R2PfcCHCHCH23P)] (1R; R = Ph and cyclohexyl (Cy); fc = ferrocene-1,1′-diyl). These compounds were synthesized from the respective phosphinoferrocene carboxaldehydes R2PfcCHO via reaction with vinylmagnesium bromide to generate 1-(phosphinoferrocenyl)allyl alcohols, which were subsequently acetylated. The resulting allyl acetates reacted smoothly with [Pd2(dba)3]/[Et3NH]Cl (dba = dibenzylideneacetone) to produce the target compounds. Complexes 1R and their nontethered analogues [PdCl(η3-C3H5)(FcPR2P)] (5R; Fc = ferrocenyl) were evaluated as pre-catalysts for the Pd-catalysed allylic amination of cinnamyl acetate with aliphatic amines and Suzuki–Miyaura-type cross-coupling of 4-tolylboronic acid with benzoyl chloride. In these reactions, better results were achieved with compounds 5R (particularly with 5Ph), presumably because they form more stable LPd(0)-type catalysts.

Graphical abstract: Synthesis and catalytic properties of palladium(ii) complexes with P,π-chelating ferrocene phosphinoallyl ligands and their non-tethered analogues

Supplementary files

Article information

Article type
Paper
Submitted
02 Apr 2024
Accepted
01 May 2024
First published
01 May 2024
This article is Open Access
Creative Commons BY-NC license

Dalton Trans., 2024,53, 8722-8731

Synthesis and catalytic properties of palladium(II) complexes with P,π-chelating ferrocene phosphinoallyl ligands and their non-tethered analogues

K. Škoch, J. Antala, I. Císařová and P. Štěpnička, Dalton Trans., 2024, 53, 8722 DOI: 10.1039/D4DT00961D

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