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The imido cage complex [Sb2Li2{ N(C6H11)}4]2, synthesised by the condensation reaction of dimeric [Sb(NMe& { p-N(CcH1l)}]Z with [LiNH(CGHll)ln (1 : 1 monomer equiv.) consists of an Sb4Li4N8 polyhedral core which can be viewed as being constructed from two interlocked 'broken' cubes.Recently we showed that the reactions of SbClx(NMe2)3-x ( x = 0-2) with various organic acids, containing 0 and N centres, gave two possible outcomes depending on the reaction solvent employed and on the particular organic acid and Sb reagent used.1.2 Surprisingly, we found that the reactions of SbCI,(NMe2)3-, ( x = 1 and 2) with organic acids in Et2O gave dimeric complexes in which Me2NH, produced as a gaseous byproduct, acts as a Lewis base donor to Sb.1 In contrast, the reactions of Sb(NMe2)3 with 1 equivalent of a primary amine (RNH?) in toluene lead to dimeric complexes, [Sb(NMe2)(y-NR)I2, in which no Me2NH ligation of Sb occurs.2 Significantly, these complexes are themselves potential metallating reagents since they contain dimeric Sb2N2 cores in which two reactive Me2N groups are retained. We have also shown recently that 'mixed-metallation' reactions of Sb(NMe2)3 can be used to prepare heterometallic complexes.3 The polynuclear Sb-amido anion complex Li[Sb3{N(C6H11)}4-(NMe2)*J is produced by the metallation reaction of Sb(NMe& with Li+[Sb{NH(C6H11)}4]-(2: 1 equiv.) and the cage complex [Sb(LiNCH2CH2Ph)3(thf)]2 is the product of the reaction of Sb(NMe& with [LiNHCH&H2Ph],(1 : 3 monomer equiv .) .3

The reactions of the imido tin@) cubane [SnNBufI4 with 3 equiv. of [CloH7NHLi] (C1OH7 = 1-naphthyl) and 6 equiv. of [C6H11PHLi] (C6H11 = cyclohexyl) produce [ Li( t hO4] + [ (BufN)( C 10H7N)3Sn3Li4hfl -4hf. PhMe 1 and [ ( Sn2(PC6H1 1)3)2L4-4thfl-2thf 2, respectively, containing the first structurally characterised polyimido and polyphosphinidine anions of a divalent group 14 metal.

Reaction of LiN(SiMe& with Cp2Sn and pmdeta produces (Cp)(Me3Si)2NSn(y-Cp)Li.pmdeta 1 which can be viewed as a model intermediate for nucleophilic substitution of Cp2Sn.We have used nucleophilic addition and substitution of heavy ments.14 However, more potent nucleophiles, such as imino p block metal cyclopentadienyl derivatives of group 13 (E = anions and organometallics, substitute the Cp ligands of Cp2E

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