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Title: Synthesis, characterization, solution behavior and theoretical studies of Pd(II) Allyl Complexes with 2-Phenyl-3H-indoles as ligands
Author: Tomé, Maria
Grabulosa, Arnald
Rocamora, Mercè
Aullón López, Gabriel
Font Bardia, Ma. Mercedes
Calvet Pallàs, Maria Teresa
López Martínez, Ma. Concepción
Keywords: Catàlisi homogènia
Compostos orgànics
Homogeneous catalysis
Organic compounds
Issue Date: 27-Sep-2019
Publisher: MDPI
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.
Note: Reproducció del document publicat a:
It is part of: Catalysts, 2019, vol. 9, num. 10, p. 811
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ISSN: 2073-4344
Appears in Collections:Articles publicats en revistes (Química Inorgànica i Orgànica)

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