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Elsevier, Journal of Organometallic Chemistry, 14(692), p. 3070-3080

DOI: 10.1016/j.jorganchem.2007.03.035

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Synthesis and reactivity towards carbon monoxide of an optically active endo five-membered ortho-cyclopalladated imine: X-ray molecular structure of trans-(μ-Cl)2[Pd(κ2-C,N-(R)-C6H4-CHN-CHMe-Ph)]2

This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

(R)-1-Phenylethyl-benzylidene-amine (1) reacted with Pd(OAc)2 in acetic acid at 60°C under nitrogen affording the acetato-bridged dinuclear endo five-membered ortho-cyclopalladated compound (μ-OAc)2[Pd(κ2-C,N-(R)-C6H4-CHN-CHMe-Ph)]2 (2) in 65% yield. Compound 2 was converted by a metathesis reaction with LiCl into the corresponding chloro-bridged dinuclear cyclopalladated compound (μ-Cl)2[Pd(κ2-C,N-(R)-C6H4-CHN-CHMe-Ph)]2 (3). 1H NMR of CDCl3 solutions of compounds 2 and 3 treated separately with py-d5, (R)-1-phenylethylamine and racemic 1-phenylethylamine were consistent with the endo cyclopalladated structure and the R absolute configuration of the chiral carbon atoms of compounds 2 and 3. Compounds 2 and 3 reacted with carbon monoxide in methanol affording, as major compounds, methyl 2-formylbenzoate (91% chemical yield) and the epimers of 3-methoxy-2-[(R)-1-phenylethyl]isoindolin-1-one (64% chemical yield) in ca. 20% diastereomeric excess, respectively. The trans isomer of compound 3 crystallized in the P21 monoclinic space group with a=10.430(4)Å, b=12.082(8)Å, c=11.168(4)Å and β=95.20(3)° and presented C–H⋯Cl intramolecular and C–H⋯Pd intermolecular non-conventional hydrogen bonds.