with the respective lithiated amido-amine in refluxing Et2O. Subsequent removal of solvent from the intensely colorized solution was followed by extraction of the crude product from pentane, filtration and again solvent removal (Scheme 4). Noteworthily, the high solubility of both title compounds in ethers and hydrocarbons was found to impede crude product purification, so vacuum sublimation was attempted instead. Here, despite the strong congruity of the ligand systems, a vast difference between 10 and 11 not in terms of volatility (for both 80 °C at 1 x 10 -1 mbar was applied) but regarding thermal stability became apparent for the first time. While the trimethylsilyl side chain substituted amide 11 was repeatedly obtained in good yields of ~ 80 % -85 %, the yields amounted only to ~ 30 % -35 % for 9 possessing the tertbutyl side chain substituted amides. This can be seen as a further illustration of the superior stabilization capability of β-silylamides in direct comparison to β-carboamides. Evans' method forwarded solution magnetic moments of 4.85 μB (10) and 4.64 μB (11). With the intention to synthesize a monomeric, homoleptic Co(II) aminopyridinate complex, lithiated 4methyl-N-(trimethylsilyl)pyridine-2-amide (Li-TMSMAPY) was prepared according to a literature reported procedure, and reacted with CoCl2 (2:1 ratio) in boiling Et2O for 12 h (Scheme 5).