E- and Z-(C-aryl)ketimines. An alternative explanation to the “n-π repulsive interaction”
✍ Scribed by Evan P. Kyba
- Publisher
- Elsevier Science
- Year
- 1973
- Tongue
- French
- Weight
- 168 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
✦ Synopsis
The effective "size" of a lone pair of electrons on an sp' nitrogen atom in saturated N-heterocycles, and thus its steric interaction with adjacent groups, which might affect conformational equilibria, has received considerable attention in recent years.' Allinger has presented a discussion which favors ignoring the lone pair altogether, and considering only the other substituents on the nitrogen atom in determining conformational equilibria of saturated g-heterocycles.'
Recently it was proposed that an important factor in determining the s-to g-isomer ratios of ketimines' of type (1) and aldimines' is an "n-s repulsive