Abstract
UV irradiation of the hexaphospha-pentaprismane cage, P 6C 4 t Bu 4, causes a structural rearrangement affording two new isomers, one involving a different closed cage structure and the other a more open cage structure containing one PC double bond. The new closed cage isomer was also unexpectedly obtained as the sole product by protonation of P 6C 4 t Bu 4 with CF 3SO 3H. Both new P 6C 4 t Bu 4 isomers were fully characterised by multinuclear NMR spectroscopy and single crystal X-ray diffraction studies.
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