An improved synthesis of unsymmetrical tetrathiafulvalenes (TTFs) (5 a-c, 5 f-g, 7) is presented which results in higher yields of unsymmetrical TTFs when compared to existing methods. The synthetic method consists of pre-equilibration of thiones containing electron withdrawing groups with P(OEt)3 a
A straightforward approach to the synthesis of unsymmetrical tatrahioalkyl tetrathiafulvalene derivatives
โ Scribed by Colin Gemmell; Jeremy D. Kilburn; Henning Ueck; Allan E. Underhill
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- French
- Weight
- 246 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0040-4039
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๐ SIMILAR VOLUMES
Methodology for synthesis of symmetrical or unsymmetrical porphyrin dimers linked at the meso positions with phenyl or stilbene functionalities is reported; 5-porphyrinyl-dipyrromethanes are key intermediates in this approach.
Isoflavanones 4a-d have been prepared in a stereocontrolled fashion using (S,S)-(+)-pseudoephedrine as a chiral auxiliary. The employed synthetic pathway consists of only four steps and involves initial formation of the stereogenic centre via diastereoselective aldol reaction of pseudoephedrine aryl