The laddering principle in lithium amide chemistry: the crystal and molecular structure of the pyrrolididolithium adduct [H2C(CH2)3NLi]3·MeN(CH2CH2NMe2)2

D R ARMSTRONG, D BARR, W CLEGG, Robert Mulvey, D REED, R SNAITH, K WADE

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Abstract

The title compound, {[H2[graphic omitted]NLi]3·PMDETA}n, (1)(PMDETA = pentamethyldiethylenetriamine), is shown to be the first example of an organonitrogen–lithium laddered structure, consisting in the solid (n= 2) of two attached (NLi)2 rings, or alternatively four (N–Li) rungs, with two terminal NLi units complexes by PMDETA, so preventing further association; cryoscopic and 7Li n.m.r. spectroscopic studies imply that extension of the ladder framework can occur in arene solutions of (1), and these results, together with those from ab initio m.o. calculations on model systems, suggest that similar compounds of type (RR′NLi·xdonor)n, but of various ladder lengths, should be preparable.
Original languageEnglish
Pages (from-to)869-870
Number of pages2
JournalJournal of the Chemical Society, Chemical Communications
Issue number11
DOIs
Publication statusPublished - 1 Jun 1986

Keywords

  • lithium amide chemistry
  • crystal structures
  • molecular structure

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