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Stereochemistry of cyclopropane ring opening in the acid-catalyzed fragmentation of endo-8-tricyclo[3.2.1.02,4]octanone

✍ 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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✦ 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.


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## Abstract Acid treatment of 9__exo__‐methyl‐__anti__^10,11^‐tricyclo[4.2.1.1^2,5^]deca‐3,7‐diene‐9__endo__, 10__endo__‐diol (**8**) leads to the two isomeric pentacyclic ethers **7** and **9** by intramolecular nucleophilic substitution of a protonated OH‐group with participation of a C,C‐double