Hetero Diels-Alder reactions / Enamino ketones 1 High-pressure reactions / Pyrans The hetero Diels-Alder reaction of enamino ketone 1 with the vinyl ethers 7-11 leading to the dihydropyrans 12a-e and 13ae is studied in dichloromethane under high pressures up to 7 kbar. The kinetics is measured by o
A MINDO/3 study of the hetero-Diels–Alder reaction
✍ Scribed by Ikchoon Lee; Eun Sook Han; Jae Young Choi
- Publisher
- John Wiley and Sons
- Year
- 1984
- Tongue
- English
- Weight
- 438 KB
- Volume
- 5
- Category
- Article
- ISSN
- 0192-8651
No coin nor oath required. For personal study only.
✦ Synopsis
The transition states involved in the hetero-Diels-Alder reactions of acrylaldehyde-ethylene and butadiene-formaldehyde systems were characterized using an efficient method of locating a saddle point on the energy surface of two coordinates calculated with MIND0/3 method. It has been shown that parallel transition and rotation of the conjugate coordinate frame lead to the reaction and orthogonal coordinate system on the hyperbolic paraboloid energy surface. It was concluded that the method we adopted is similar to the "X-method" but is much simpler to apply to real reaction systems.
📜 SIMILAR VOLUMES
## Abstract DFT calculations at the B3LYP/6‐311+G(d,p) level for the C, H, and O atoms and at the 6‐311+G(2df,p) level for the S atom were used to study the hetero‐Diels–Alder reactions between several α‐oxothiones and ethylene or methyl vinyl ether (MVE). All the transition states and the intermed