N,N′,N′-Trimethylethylendiamin-substituierte Phosphor(III)-Verbindungen und deren Oxidation zu Derivaten mit tetra- und pentakoordiniertem Phosphor / N,N′,N′-Trim ethylethylenediamine-Substituted Phosphorus(III) Com pounds and their Oxidation to Derivatives with Four-and Five-Coordinated Phosphorus

Abstract

A study was made of the intramolecular donor-acceptor interaction in N,N′,N′-trimethylethylenediamine- substituted phosphorus compounds, involving λ3-, λ4- and λ5-phosphorus atoms, as a function of the nature of the substituents at phosphorus. The reaction of N-trimethylsilyl-N,N′,N′-trimethylethylenediamine (1) with (PriO)2PCl furnished the acyclic, trimethylethylenediamine-substituted phosphorus(III) compound 4. There is no NMR spectroscopic evidence for an intramolecular donor-acceptor interaction between the phosphorus atom and the nitrogen atom of the dimethylamino group in 4. The oxidation of the trivalent phosphorus atom in 4 and in the related compound 5 by sulfur, selenium, tetrachloroo- benzoquinone, and hexafluoroacetone led to the corresponding λ4P compounds 6 - 9 and to the λ5P compounds 10 and 11. No intramolecular donor-acceptor interaction could be detected in any of these products. There was no reaction between 5 and elemental tellurium. The reaction products were characterized by NMR spectroscopy, mass spectrometry, and by elemental analysis.