The title compound is best described not as two superimposed cyclic trimers, but rather as a “cyclic ladder” with six rungs. In crystalline form it exists as the hexamer 1. This is the first noncomplexed oligomeric lithium amide derivative with n > 4, as well as the first that does not consist of a simple, planar (NLi)n ring. Cryoscopic and 7Li NMR measurements verify that solutions of 1 contain not only the hexamer but also higher aggregates.
- lithium amide ladder
BARR, D., CLEGG, W., HODGSON, S. M., LAMMING, G. R., Mulvey, R., SCOTT, A. J., ... WRIGHT, D. S. (1989). [H2C(CH2)5NLI]6, the first cyclized lithium amide ladder: synthesis and structure of hexamethyleneimidolithium. Angewandte Chemie International Edition, 28(9), 1241-1243. https://doi.org/10.1002/anie.198912411