CHEMISTRY OF POLYFUNCTIONAL MOLECULES .112. RING ENLARGEMENT REACTIONS OF A SPIROCYCLIC COBALTAPHOSPHAZENE WITH OXYGEN, SULFUR, AND SELENIUM

The spirocyclic cobaltaphosphazene 1 which contains cobalt-connected three-, five-, and six-membered rings undergoes ring enlargement reactions by treatment with O2, S8, and Se8. The resulting paramagnetic spirocyclic cobalta-phosphazenoids 2a-c (E = O, S, Se) consist of eight-membered chelate rings connected at the spiro-cobalt(II) centre forming a tetrahedral CoE4 core. The compounds 2a-c have been characterized by X-ray analyses, H-1, C-13{H-1}, P-31{H-1} NMR, IR, Raman, UV/Vis/NIR, EI/FD mass spectroscopy, and magnetic measurements.