The 2,4-di-tert-butyl-6-(1-piperidino)phenyl group is utilized to stabilize diselenoxophosphorane and the structure determined by X-ray analysis indicates coordination of the nitrogen lone-pair to the P-atom to form a four-membered ring with a remarkably distorted P–C–C bond angle.
M. Yoshifuji, S. Sangu, K. Kamijo and K. Toyota, J. Chem. Soc., Chem. Commun., 1995, 297 DOI: 10.1039/C39950000297
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