Aminostannanes and aminostannylenes containing a C,N-chelated ligand

Aminotin(II and IV) compounds {[(2,6-i-Pr-C6H3)(H)N]-μ-(Sn)-Cl}2, {2-[(CH3)2NCH2]C6H4}2Sn[N(H)(2,6-i-Pr-C6H3)]2 and {2-[(CH3)2NCH2]C6H4}Sn[N(2,6-i-Pr-C6H3)(SiMe3)] were prepared by lithium halide elimination from tin halides and corresponding lithium complexes. [(2,6-i-Pr-C6H3)(H)N]Li (1) reacts with one half of molar equivalent of SnCl2 to give {[(2,6-i-Pr-C6H3)(H)N]-μ-(Sn)-Cl}2. The same lithium amide (1) gave with R3SnCl corresponding aminostannanes. Further reactions of these compounds with n-butyllithium gave the starting 1 and tetraorganostannanes. {2-[(CH3)2NCH2]C6H4}2SnBr2 reacts with two equivalents of 1 to {2-[(CH3)2NCH2]C6H4}2Sn[N(H)(2,6-i-Pr-C6H3)]2. The dimeric heteroleptic stannylene {[(2,6-i-Pr-C6H3)(SiMe3)N](μ2-Cl)Sn}2 reacts with 2-[(CH3)2NCH2]C6H4Li to the monomeric {2-[(CH3)2NCH2]C6H4}Sn[N(2,6-i-Pr-C6H3)(SiMe3)]. The structure in the solid state and in solution and reactivity of products is also discussed. The unique decatin cluster has been isolated by hydrolysis of {[(2,6-i-Pr-C6H3)(H)N]-μ-(Sn)-Cl}2. The structure of some compounds was also evaluated by theoretical DFT methods.