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Crystal structure of a heavier alkali metal diisopropylamide complex: a discrete (KN)(2) ring dimer with TMEDA chelation and short intramolecular K center dot center dot center dot H(C)contacts

Clegg, W and Kleditzsch, S and Mulvey, Robert and O'Shaughnessy, P (1998) Crystal structure of a heavier alkali metal diisopropylamide complex: a discrete (KN)(2) ring dimer with TMEDA chelation and short intramolecular K center dot center dot center dot H(C)contacts. Journal of Organometallic Chemistry, 558 (1-2). pp. 193-196. ISSN 0022-328X

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Abstract

Synthesized by treating diisopropylamine with a potassium reagent (the solid isolated from a 1:1 reaction mixture of potassium t-butoxide and n-butyllithium) in the presence of N,N,N',N'-tetramethylenediamine (TMEDA), the potassium diisopropylamide complex [((Pr2NK)-Pr-i. TMEDA)(2)] has been subjected to a low temperature X-ray diffraction study. This reveals a discrete dimeric arrangement centred on an asymmetrical (KN)(2) cyclic ring, with bond lengths of 2.706(2) and 2.837(2) Angstrom and endocyclic bond angles of 100.54(5) and 79.46(5)degrees (at K and N, respectively). Terminal, chelating TMEDA ligands complete the distorted tetrahedral N, primary coordination sphere about the K+ cations. However, there are several secondary intramolecular K ... H(C) contacts involving methyl fragments of the diisopropylamido ligands. (C) 1998 Elsevier Science S.A. All rights reserved.

Item type: Article
ID code: 38198
Keywords: amide, crystal structure, intramolecular bonding, potassium, lithium, sodium, reactivity, amides, LDA, Chemistry, Materials Chemistry, Biochemistry, Organic Chemistry, Physical and Theoretical Chemistry, Inorganic Chemistry
Subjects: Science > Chemistry
Department: Faculty of Science > Pure and Applied Chemistry
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 06 Mar 2012 12:52
    Last modified: 05 Sep 2014 15:24
    URI: http://strathprints.strath.ac.uk/id/eprint/38198

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