✦ LIBER ✦
Bicyclo[4.2.0]octa-1,3,5-triene: 2-Mono- and 2,5-Disubstituted Derivatives via Highly Regioselective Lithiation of Its Cr(CO)3 Complex and via Reductive Silylation/Oxidation
✍ Scribed by E. Peter Kündig; Celia Ferret; Bruno Rudolph
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- German
- Weight
- 680 KB
- Volume
- 73
- Category
- Article
- ISSN
- 0018-019X
No coin nor oath required. For personal study only.
✦ Synopsis
The order of directing ability is modified on complexation, the most remarkable change being the high efficiency of the F-group.
The AB system of H-C(4) and H-C(5) of 4 overlaps with a signal associated with 3 (4.61 ppm). When the lithiation was carried out at -40°, 7 YO of 4 and 82 % of 3 were formed.