The reaction of Ph2P(NSiMe3)[N(SiMe3)2] with RSeCl3(R = Ph, Me, Et) in acetonitrile produces 1,5-Ph4P2N4Se2R2[R = Ph, (1a); Me, (1b); Et, (1c)] and 1,5-Ph4P2N4Se2, (2a) when R = Me or Et; X-ray crystallography shows that (1b) is an eight-membered chair with the two selenium atoms displaced on either side of the P2N4 plane by 1.073(2)Å.
T. Chivers, D. D. Doxsee and J. F. Fait, J. Chem. Soc., Chem. Commun., 1989, 1703 DOI: 10.1039/C39890001703
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