Adamantane-like cages are formed when H2P(CH2)(n)PH2 (n = 2 or 3) react wit
h acetylacetone or trifluoroacetylacetone and the crystal structures of the
dichloropalladium(II) complexes of the C-3-diphosphine ligands show that t
heir cone angles are much larger than (Bu2P)-P-t(CH2)(3)PBu2t; a diphospha-
adamantane derived from o-C6H4(PH2)(2) is also described.