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[H2C(CH2)5NLI]6, the first cyclized lithium amide ladder: synthesis and structure of hexamethyleneimidolithium

BARR, D and CLEGG, W and HODGSON, S M and LAMMING, G R and Mulvey, Robert and SCOTT, A J and SNAITH, R and 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). pp. 1241-1243. ISSN 1433-7851

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Abstract

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.