Is the¹<i>J</i>_PSeCoupling Constant a Reliable Probe for the Basicity of Phosphines? A³¹P NMR Study

Abstract

The influence of different heteroaryl and functionalized aryl substituents on the electron-donating ability and basicity of the phosphorus atoms in heteroaryl phosphines and diphosphines has been determined by the use of the direct 1JPSe coupling constants of the corresponding selenides. The generality of the use of 31P–77Se spin–spin coupling constants as probe for the basicity of phosphines is discussed as well as the scope and limits of this concept. GRAPHICAL ABSTRACT Keywords: Phosphine selenideheteroaryl phosphines 31P–77Se spin–spin coupling constant Acknowledgments D. Süslüyan thanks all the members of the institute for providing the organophosphorus compounds.