PUB - Publikationen an der Universität Bielefeld

The cyclic triaminal 1,3,5-tri-tert-butyl-1,3,5-triazacyclohexane (TtBuTAC) was treated with tBuLi, but instead of the expected deprotonation at a CH2 unit, the [(TtBuTAC)(tBuLi)] (2) adduct was formed. This is a monomeric tetracoordinate form of tBuLi; its molecular structure was determined by single-crystal X-ray diffraction (XRD) and it is likely to be monomeric in C6D6 solution according to H-1 NMR, C-13 NMR, and Li-7 NMR spectroscopy. TtBuTAC reacts with nBuLi to give a laddertype [(TtBuTAC)(nBuLi)(2)](2) aggregate of four nBuLi units terminated by two TtBuTAC ligands. This adduct was characterized by NMR spectroscopy and XRD. It slowly decays in solution, and minor quantities of a [TtBuTAC-Li(-nBu)](2)[Li-3(nBu)(2)N(tBu)(n-pent)] product were obtained and characterized by XRD. This compound contains amide units from the reaction of the formal monomer of TtBuTAC, Me3C-N=CH2, with nBuLi, which demonstrates the different types of reactivity of trisaminals such as TtBuTAC.