Back to Search
Start Over
Terpenols as substituents for the diastereoselective formation of enantiomerically pure triple lithium-bridged helicate type-coordination compounds.
- Source :
-
Dalton transactions (Cambridge, England : 2003) [Dalton Trans] 2014 Oct 21; Vol. 43 (39), pp. 14636-43. - Publication Year :
- 2014
-
Abstract
- The terpenols l(-)-borneol, (1S2S3S5R)-3-pinanol, (-)-menthol, and (-)-myrtenol are easily available chiral alcohols for the preparation of enantiomerically pure catechol esters -H2. Those ligands are used for the hierarchical assembly of triple lithium-bridged dinuclear titanium(iv) triscatecholate helicates Li[Li3()6Ti2]. In solution, the dimeric species are in a solvent dependent equilibrium with the monomer Li2[()3Ti]. The equilibrium is studied by (1)H NMR. CD spectroscopy indicates that the configuration at the complex units of the enantiomerically pure dimeric α-chiral derivatives Li[Li3()6Ti2] is opposite to the configuration of the monomers Li2[()3Ti]. For the γ-chiral complex Li2[()3Ti] only a de of 25% is observed and in this case no interpretation of the mechanism of stereocontrol is possible.
Details
- Language :
- English
- ISSN :
- 1477-9234
- Volume :
- 43
- Issue :
- 39
- Database :
- MEDLINE
- Journal :
- Dalton transactions (Cambridge, England : 2003)
- Publication Type :
- Academic Journal
- Accession number :
- 25141169
- Full Text :
- https://doi.org/10.1039/c4dt01553c