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.
Original language | English |
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Pages (from-to) | 193-196 |
Number of pages | 4 |
Journal | Journal of Organometallic Chemistry |
Volume | 558 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 15 May 1998 |
Keywords
- amide
- crystal structure
- intramolecular bonding
- potassium
- lithium
- sodium
- reactivity
- amides
- LDA