Getting cagey: Dimerisation and coordination to lithium ions was observed after the reaction of the cage [P2{(SiMe2)2O}3] with Li[Al{OC(CF3)3}4]. The obtained complex ion [Li§P4{(SiMe2)2O}6]+ can be decomposed by addition of THF yielding the free dimeric ligand [P4{(SiMe2)2O}6].
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Hänisch et al. (2009) studied this question.
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