O. Walter et al., NEW BICYCLO[2.2.2]OCTANE-TYPE CAGE COMPOU NDS OF SILICON AND PHOSPHORUS, Journal of organometallic chemistry, 529(1-2), 1997, pp. 103-106
The tripodal triphosphide H3CC[CH2P(Ph)(Li)](3) reacts with MeSiCl3 to
yield the triphosphinosilane H3CC[CH2P(Ph)](3)SiMe, 2a. The analogous
reaction with PBr3 produces the triphosphinophosphine H3CC[CH2P(Ph)](
3)P, 2b. The bicyclo[2.2.2]octane-type cage structure of 2 is revealed
by NMR data as well as X-ray analyses. 2b is one of the rare examples
of a compound with mere C-3-symmetry.