## Abstract For Abstract see ChemInform Abstract in Full Text.
A [4 + 3] transition state for a [4 + 2] cycloaddition. A new secondary orbital interaction in Diels-Alder reactions
β Scribed by Singleton, Daniel A.
- Book ID
- 126120332
- Publisher
- American Chemical Society
- Year
- 1992
- Tongue
- English
- Weight
- 865 KB
- Volume
- 114
- Category
- Article
- ISSN
- 0002-7863
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π SIMILAR VOLUMES
The Lewis acid catalyzed Diels-Alder reactions of 4-acetoxycyclopentenone 3 with both cyclic and acyclic dienes is described. Subsequent base induced elimination of the B-acetoxy group from the respective cycloadducts Ieaak to bi-and tricyclic erwnes in good yields. The x-facial diastereoselectivity
## Abstract Some novel DielsβAlder reactions of the opium alkaloid (β)βthebaine (1) as an electronβrich diene and a reinvestigation of its reactions with cyclic and acyclic dienophiles are described. The Οβfacial selectivity has been studied on the basis of structural analyses of the cycloadducts.