Ever since their first synthesis in 1974 monomeric tin(II) and lead(II) amides have attracted con­ siderable interest as a consequence of their carbenoid electronic structure [1 6]. Although the sub­ stituents at the nitrogen atoms have been varied to some extent, N-dialkylboryl groups have received only scant attention. One attempt to use a N-dimethylboryl group has afforded a dimer after elim...

A fluorenyl (Fl) tethered diamine was synthesised by nucleophilic substitution of (bromoethyl)fluorene with a diisopropylphenyl (Dipp) substituted diamine to give FlC2H4N(H)C2H4N(H)Dipp (1a) in good yield (85%). Lithiation of 1a with n-BuLi proceeded with coordination of the Li cation to the aromatic fluorenide ring (2), and with subsequent equivalents of n-BuLi, the secondary amines were then ...

The reactivity of the racemic N-heterocyclic stannylene [{MeHCN(tBu)}Sn] (1) with chalcogenide elements O2, S, Se, and Te has been investigated. In case reaction 1 molecular oxygen, cyclic tristannoxane complex [{MeHCN(tBu)}2Sn(μ-O)]3 (3) was isolated characterised. NMR studies (1H, 13C, 119Sn) show formation D3- C2- symmetric assemblies. Te, respectively, yielded cyclo-distannachalcogenide com...

A systematic study to access stable stannaimines is reported, by combining different heteroleptic stannylenes with a range of organic azides. The reactions terphenyl-/hypersilyl-substituted yield the putative tin nitrogen double bond, but directly followed 1,2-silyl migration give SnII systems featuring bulky silylamido ligands. By contrast, transition from two σ donor ligand set mixed σ-donor/...

We report fundamental studies on the reactivity of the 2-arsaethynolate anion (AsCO- ), a species that has only recently become synthetically accessible. The reaction of AsCO- with the bulky stannylene Ter2 Sn (Ter=2,6-bis[2,4,6-trimethylphenyl]phenyl) is described, which leads to the unexpected formation of a [Ter3 Sn2 As2 ]- cluster compound. On the reaction pathway to this cluster, several i...

The new class of homo- and heteroleptic n-butyl-N,N'-disubstituted amidinato group 14 metal(II) complexes were prepared by salt elimination from starting lithium amidinates and metal(II) chlorides both in stoichiometric ratio 2:1 and 1:1, respectively. The target amidinates contain less bulky isopropyl or cyclohexyl as well as a sterically demanding aromatic substituent. Desired 1:1 Pb(II) comp...