✦ LIBER ✦
Phasentransferkatalysierte Wittig-Reaktionen ohne Basenzusatz
✍ Scribed by Koßmehl, Gerhard ;Nuck, Rolf
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1979
- Tongue
- English
- Weight
- 250 KB
- Volume
- 112
- Category
- Article
- ISSN
- 0009-2940
No coin nor oath required. For personal study only.
✦ Synopsis
Basefree Wittig Reactions with Phase Transfer Catalyts
Ketones like trifluoroacetyl compounds — giving the haloform reaction in basic solutions — are able to react with mono or bis phosphonium fluorides without bases via Wittig reactions with very good yields. The phosphonium fluorides are prepared very easily from other phosphonium halides under phase transfer catalysis of crown ethers. The ratio of the stereoisomeric alkenes in the product and the spectra of the trans‐ respectively trans‐trans alkenes are given.