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.
| Language | English |
|---|---|
| Pages | 193-196 |
| Number of pages | 4 |
| Journal | Journal of Organometallic Chemistry |
| Volume | 558 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - 15 May 1998 |
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Keywords
- amide
- crystal structure
- intramolecular bonding
- potassium
- lithium
- sodium
- reactivity
- amides
- LDA
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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 ; Kleditzsch, S ; Mulvey, Robert; O'Shaughnessy, P .
In: Journal of Organometallic Chemistry, Vol. 558, No. 1-2, 15.05.1998, p. 193-196.Research output: Contribution to journal › Article
TY - JOUR
T1 - 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
AU - Clegg, W
AU - Kleditzsch, S
AU - Mulvey, Robert
AU - O'Shaughnessy, P
PY - 1998/5/15
Y1 - 1998/5/15
N2 - 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.
AB - 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.
KW - amide
KW - crystal structure
KW - intramolecular bonding
KW - potassium
KW - lithium
KW - sodium
KW - reactivity
KW - amides
KW - LDA
U2 - 10.1016/S0022-328X(98)00391-X
DO - 10.1016/S0022-328X(98)00391-X
M3 - Article
VL - 558
SP - 193
EP - 196
JO - Journal of Organometallic Chemistry
T2 - Journal of Organometallic Chemistry
JF - Journal of Organometallic Chemistry
SN - 0022-328X
IS - 1-2
ER -