## Abstract The addition of difluorocarbene to bicyclo[2.2.2]octaβ2,5βdiene gave the __exo__ and __endo__ 1:1 cyclopropane adducts. In contrast to norbornadiene, no __homo__β1,4 adduct was formed. The adducts were thermally stable under the conditions of their formation and separation (<170Β°). Howe
Pyramidalized olefins: The stereospecific conjugate reduction of a bicyclo[2.2.2]octadiene
β Scribed by Richard Vaughan Williams; Vijay R. Gadgil; Gary G. Garner; John D. Williams; Ashwani Vij
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- French
- Weight
- 107 KB
- Volume
- 40
- Category
- Article
- ISSN
- 0040-4039
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β¦ Synopsis
Structure determination on 2-benzenesulphonyl-3-trimethylsilylbicyclo[2.2.2]octa-2,5-diene (3) demonstrates that the double bonds are pyramidalized in the exo direction. Nucleophilic attack (conjugate reduction) on 3 parallels this pyramidalization and occurs exclusively from the endo face.
π SIMILAR VOLUMES
Below -60' in FSOaH/SOzClF the nonamethyl bicyclo[3.2.1 loctadien-Pyl cation J, undergoes two degenerate rearrangements, circumambulation' and a 1,2-shift of the methano bridge.2 The first of these processes is much faster than the second, and is nmr-observable,' whereas the second process was detec
## Abstract The tricyclic lactams 4aβh, possessing a bicyclo[2.2.2]octadiene moiety, obtained by intramolecular DielsβAlder reaction of the vinylidene malondiamides 1aβh, generally isomerize in boiling xylene to give the new lactams 7aβh, now bearing a bicyclo[3.2.1]octadiene part. The difference i