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The reactions of the imido tin(II) cubane [SnNBut]4 with 3 equiv. of [C10H7NHLi](C10H7= 1-naphthyl) and 6 equiv. of [C6H11PHLi](C6H11= cyclohexyl) produce [LI(thf)4]+[(ButN)(C10H7N)3Sn3Li·thf]–·thf·PhMe 1 and [{Sn2(PC6H11)3}2Li4·4thf]·2thf 2, respectively, containing the first structurally characterized polyimido and polyphosphinidine anions of a divalent group 14 metal.
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Beswick et al. (1996) studied this question.
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