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Adamantane-like cages are formed when H2P(CH2)nPH2 (n = 2 or 3) react with acetylacetone or trifluoroacetylacetone and the crystal structures of the dichloropalladium(II) complexes of the C3-diphosphine ligands show that their cone angles are much larger than But2P(CH2)3PBut2; a diphospha-adamantane derived from o-C6H4(PH2)2 is also described.
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Gee et al. (1999) studied this question.
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