Abstract
When the di-aryl or di-alkyl phenyl phosphonamide (RNH)2P(O)Ph 1 is treated with sulfur(I) chloride (S2Cl2) in base, the product is an unexpected, unusual seven-membered diazatetrathiaphospha heterocycle 3; the X-ray structure and NMR spectra of these two unique heterocycles indicate that they exist in a pseudo-chair conformation with steric congestion limiting the freedom of rotation of the phenyl group; and represent the first known examples of this hetero-ring system.
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