Stereochemistry of cyclopropane ring opening in the acid-catalyzed fragmentation of endo-8-tricyclo[3.2.1.02,4]octanone
β Scribed by Merle A. Battiste; Judith Mackiernan
- Publisher
- Elsevier Science
- Year
- 1972
- Tongue
- French
- Weight
- 145 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0040-4039
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β¦ Synopsis
The reported instances of inversion of configuration in the acid-catalyzed opening of cyclopropane rings are rare.2 The recent report' of exclusive inversion in the hydrogen chloride promoted opening of a fused cyclopropane ring prompts us to amplify our previous observations4 of a similarly striking stereochemical result in the acid-catalyzed fragmentation of endo-8-tricyclo[3.2.1.
π SIMILAR VOLUMES
In our search for appropriate substrates which might be employed in a study of the mode of electrophilic attack of strained carbon-carbon bonds, we have iuvestigated the acid promoted cleavage of the three-membered ring in em-tricyclo~.2.1.02~~octaue, I. I In this cmmuuication we report and discuss
We report a striking example of unprecedented regiospecificity in the addition of acetic acid to endo-tricyclo[3.2.1.0z"]oct-6-ene (1). The addition proceeds with surprising ease in acetic acid at 80' (3 days) or at room temperature in the presence of catalytic amounts of toluenesulphonic acid to yi
## Abstract Acid treatment of 9__exo__βmethylβ__anti__^10,11^βtricyclo[4.2.1.1^2,5^]decaβ3,7βdieneβ9__endo__, 10__endo__βdiol (**8**) leads to the two isomeric pentacyclic ethers **7** and **9** by intramolecular nucleophilic substitution of a protonated OHβgroup with participation of a C,Cβdouble