Formation and Structural Aspects of Four-, Five-, and Six-Membered Phosphorus Nitrogen Ring Compounds

Abstract

The donor-stabilized dithiomonometaphosphoryl chloride py-PS₂Cl (py = pyridine) reacts with primary amines, RNH₂, in defined molar ratios to four-ring heterocycles. Whether diaza - or azathiadiphosphetidines are formed depends on the rest R, the basicity of the amines and the reaction conditions. In a similar way the ring size of the P-N heterocycles obtained from py-PS₂Cl and monosubstituted hydrasines is determined by the substituents at hydrazine, The influence of steric factors on the probable reaction mechanisms and some structural features of the obtained heterocycles are discussed.