Thermodynamic asymmetric induction: a new approach to the development of rules for the determination of absolute configurations
β Scribed by Morton Raban; Christophe P. Moulin; Sanford K. Lauderback; Brian Swilley
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- French
- Weight
- 250 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
β¦ Synopsis
The absolute configurations of chiral primary amines can be determined using the optical rotations of the corresponding N-p-toluenesulfonyl-N-2,4-dinitrobenzensulfenyl derivatives.
Kinetic asymmetric induction has been used as the basis for numerous methods for the determination of absolute and relative configurations. 2 Successfully and commonly used methods based upon asymmetric synthesis and kinetic resolution have been embodied in such rules as Prelog's Rule, 3 Cram's Rule, 4 Horeau's Rule, 5 and others. 6 This paper outlines a strategy for development of similar rules based on thermodynamic asyrmnetric induction -l at stereolabile chiral units and describes one such rule employing the sulfenamide chiral axis.
π SIMILAR VOLUMES
## Abstract Enantiopure Ξ±βamino acids were converted to 4βsubstituted 2βarylβ and 2βalkylβ5(4__H__)βoxazolones under partial racemization. These nonracemic mixtures were dissolved in CDCl~3~, an equimolar amount of the chiral dirhodium complex $Rh^{\rm (II)}\_{2}$[(__R__)β (+)β MTPA]~4~ (MTPAβH = M
It is shown that the cheap and easily prepared mandelic acid esters (or their OAc analogues) are best suited than the expensive, although usually employed, OMe mandelic acid esters to assess both the enantiomeric excesses and absolute configurations of secondary alcohols.