✦ LIBER ✦
Preparation and Absolute Configuration of Some Iris Essential Oil Constituents of the 5-methylsafranic-acid series
✍ Scribed by Christian Chapuis; Karl H. Schulte-Elte
- Publisher
- John Wiley and Sons
- Year
- 1995
- Tongue
- German
- Weight
- 833 KB
- Volume
- 78
- Category
- Article
- ISSN
- 0018-019X
No coin nor oath required. For personal study only.
✦ Synopsis
Ca. 18000 US%/kg of absolute oil. We are indebted to Prof. J. Garner0 and D . Joulain for a copy of this analysis. This is an energetically unfavorable (uphill) transformation. Indeed, 13c is totally converted into 16c under basic conditions (MeONa, MeOH, 0.1 mol-equiv., 2 5 O ; 90%). For a comparison of the thermodynamic stability of 13c and 16c, calculated by semi-empirical method PM3 (negative values in kcal/mol f2.0, MOPAC 6.0 QCPE), see [3], and for stereoisomer comparison, based on MM2 calculations (positive values in KJ/mol, MACROMODEL 4.0), see [4]. Thus, tram-8a: 103.4,