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Giving phenyllithium a right-handed double-helical twist. Syntheses and crystal structures of enantiopure alkyl-, aryl-, and amidolithium aggregates
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- Håkansson, Mikael, 1957 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry
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- Vestergren, Marcus (author)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry
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- Eriksson, J (author)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry
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- 2003
- 2003
- English.
- In: Journal of Organometallic Chemistry. ; 682:1-2, s. 172-179
- Journal article (peer-reviewed)
Abstract
Subject headings
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- The influence of enantiopure nitrogen donor ligands on structure and aggregation in three lithium reagents has been investigated using single crystal X-ray diffraction methods. While the 1:1 complex between methyllithium and (−)-sparteine, [LiMe(spa)]2 (1), is dimeric, the 2:1 complex between phenyllithium and (−)-sparteine, [Li4Ph4(spa)2] (2), displays a tetranuclear Li4Ph4 core with one sparteine ligand in each end. The core in 2 has a laddered structure, which resembles a double-helix in the sense that it is twisted corresponding to approximately one ninth of a full rotation. The stereochemistry is predetermined to a right-handed double-helix by the terminal sparteine ligands. Synthesis and structural characterization of homoleptic [Li(pymp)]4 (3), PYMP=(S)-2-(1-pyrrolidinylmethyl)pyrrolidido, displays a tetramer with a helical twist analogous to 2, which shows that this bidentate enantiopure amido ligand (pymp) also predetermines the chirality to a fragmented right-handed double-helix.
Subject headings
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- Organolithium; Enantiopure; Crystal structure; Double helix; Aggregation
Publication and Content Type
- ref (subject category)
- art (subject category)
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