Xy. Sun et al., DICHROMIUM CAGE COMPLEXES OF CYCLOTETRA-PHOSPHOXANE, CYCLOPENTA-PHOSPHOXANE, AND CYCLOHEXA-PHOSPHOXANE, Journal of the Chemical Society, Chemical Communications, (2), 1994, pp. 237-238
Metal-assisted assembly of cis-dimethylpiperidinophosphine oxide (DMP-
P=O) units around chromium carbonyl at progressively higher temperatur
es affords dichromium complexes of cyclotetraphosphoxane (two isomers)
, cyclopentaphosphoxane, and ultimately, the novel cyclohexaphosphoxan
e.