(1,2-Bis(diphenylphosphino)ethane)(η3-1-arylallyl)palladium Tetrafluoroborates. Distribution of the Positive Charge Density by Correlation of NMR Chemical Shifts with Hammett Substituent Constants

Ramón Malet, Marcial Moreno-Mañas, Teodor Parella, Roser Pleixats

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29 Citations (Scopus)

Abstract

13C NMR differences of chemical shifts (δx — δH) of allyl carbon atoms in a series of (1,2-bis(diphenylphosphino)ethane)(η3-1-(4-X-phenyl)allyl)palladium tetrafluoroborates, X ranging from NO2 to OMe, correlate very well (r > 0.994) with σ Hammett constants. However, 31P NMR differences of the ligand cis and trans phosphorus atoms correlate well with σ and with σ+, respectively. These data indicate that the positive charge density of the cation is localized mainly in the P—Pd—P region. © 1995, American Chemical Society. All rights reserved.
Original languageEnglish
Pages (from-to)2463-2469
JournalOrganometallics
Volume14
Issue number5
DOIs
Publication statusPublished - 1 Jan 1995

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