peri-Interactions are important in determining both the conformation of the dihydropyran ring of 2-benzopyrans as well as the stereochemistry of its substituents.
Conformational isomerism in dihydropyran. Conjugative stabilization of the half-chair conformer
β Scribed by C.Hackett Bushweller; James W. O'Neil
- Book ID
- 104240117
- Publisher
- Elsevier Science
- Year
- 1969
- Tongue
- French
- Weight
- 167 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
β¦ Synopsis
The various roles of the lone pair in the conformational dynamics and preferences of medium heterocycles are not clearly defined (11, although certain cases seem clear, e.g., the "E-axial effect" (2).
π SIMILAR VOLUMES
We have previously (2) described an unusual type of conformational preference effect vhich vaa found to operate in ring A of some 3-substituted (-OH and -N3), A 5(10) -steroids. From the RMR spectra of these epimer pairs in the C-3 proton region, It was evident that the 3a-and
In previous paper, 2,3 we have reported that 13 C NMR spectroscopy can be efficiently applied to the configurational assignment of epoxides and episulfides on six-membered rings. these investigations,