What is the most significant result of this study? Our paper reports on novel P-N-P-containing compounds which can be prepared by reducing N,N-bis{chloro(aryl)-phosphino}-amines. Due to the variation of the substituents at the phosphorus or nitrogen centers, the solvents and reducing agents, we were able to develop selective syntheses for several cyclic compounds. We consider the formation of new PN rings as the essence of this paper.