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2019-09-27

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cc-by (c) Tomé, Maria et al., 2019
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/141740

Synthesis, characterization, solution behavior and theoretical studies of Pd(II) Allyl Complexes with 2-Phenyl-3H-indoles as ligands

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https://doi.org/10.3390/catal9100811

Abstract

The study of the reactivity of three 2-phenyl-3H-indole ligands of general formulae C8H3N-2-(C6H4-4-R1)-3-NOMe-5-R2 (1) [with R1 = H, R2 = OMe (a); R1 = R2 = H (b) or R1 = Cl, R2 = H (c)] with [Pd(η3-1-R3C3H4)(μ-Cl)]2 (R3 = H or Ph) has allowed us to isolate two sets of new Pd(II)-allyl complexes of general formulae [Pd(η3-1-R3C3H4)(1)Cl] {R3 = H (2) or Ph (3)}. Compounds 2a-2c and 3a-3c were characterized by elemental analyses, mass spectrometry and IR spectroscopy. The crystal structures of 2a, 3a and 3b were also determined by X-ray diffraction. 1H-NMR studies reveal the coexistence of two (for 2a-2c) or three (for 3a-3c) isomeric forms in CD2Cl2 solutions at 182 K. Additional studies on the catalytic activity of mixtures containing [Pd(η3-C3H5)(μ-Cl)]2 and the parent ligand (1a-1c) in the allylic alkylation of (E)-3-phenyl-2-propenyl (cinnamyl) acetate with sodium diethyl 2-methylmalonate as well as the stoichiometric reaction between compounds 3a and 3c with the nucleophile reveal that in both cases the formation of the linear trans- derivative is strongly preferred over the branched product. Computational studies at a DFT level on compound 3a allowed us to compare the relative stability of their isomeric forms present in solution and to explain the regioselectivity of the catalytic and stoichiometric processes.

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Catàlisi homogènia, Lligands, Compostos orgànics

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Homogeneous catalysis, Ligands, Organic compounds

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Articles publicats en revistes (Química Inorgànica i Orgànica)

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TOMÉ, Maria, et al. Synthesis, characterization, solution behavior and theoretical studies of Pd(II) Allyl Complexes with 2-Phenyl-3H-indoles as ligands. Catalysts. 2019. Vol. 9, num. 10, pags. 811. ISSN 2073-4344. [consulted: 19 of August of 2026]. Available at: https://hdl.handle.net/2445/141740

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