Abstract
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.
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