The free energies of activation for bond shift in fluoro-, chloro-, bromo-ad iodocyclocxtatetraencin THF-d8weredeterminedby 13CNMR spectroscopyto lx 12.7, 15.0, 15.4 sad 16.1 kcal/mol, respectively, at 298 K. Anafysis of HF/6-31G\*-op!imizedgeomcuies and natural atomicchargesfor the groundstate and
Role of bifurcation in the bond shifting of cyclooctatetraene
✍ Scribed by Obis Castaño; Raúl Palmeiro; Luis Manuel Frutos; José Luisandrés
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- English
- Weight
- 851 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0192-8651
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
The present study of the cyclooctatetraene potential energy surface shows the presence of a bifurcation (valley ridge inflection point) in the intrinsic reaction coordinate path between the two transition states of D~8h~ and D~4h~ symmetries. This result is of capital importance for the correct understanding of the bond shifting and ring inversion processes in this compound. © 2002 Wiley Periodicals, Inc. J Comput Chem 23: 732–736, 2002
📜 SIMILAR VOLUMES
Cycloaddition of an optically pure triazolinedione to a racemic cyclooctatetraene, followed by separation of the resulting diastereomers and hydrolysis-oxidation, delivers the polyolefin in high enantiomeric purity.