1992•Heteroatom ChemistryRequires access

Lewis acid properties of phosphenium and arsenium cations: Study of their adducts with pyridine

Corinne Payrastre, Yves Madaule, Jean Gérard Wolf, Tag Chong Kim, Marie‐Rose Mazières, Robert Wolf, Michel Sanchez

Abstract

Abstract In the growing field of dicoordinated Group 15 cations, the quantitative study of the Lewis acid properties of phosphenium or arsenium cations has not yet been undertaken. Moreover, there are only a few described examples of syntheses of arsenium cations. The aim of this work is to enhance this series and to develop a quantitative comparative study of their complexation with Lewis bases such as pyridine. The observation of the 13C NMR C‐4 variation in the pyridine ring is a good probe to obtain the apparent equilibrium constant Kc and thus a Lewis acidity scale. Phosphenium cations are more acidic than arsenium cations.

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Key concepts: Chemistry, Pyridine, Lewis acids and bases, Adduct, Ring (chemistry), Equilibrium constant, Inorganic chemistry, Medicinal chemistry