Several tricyclic compounds exist in nature with a cyclopropane ring fused to a cis-decalin structure, as shown in the molecule tricyclo[5.4.01.3.01.7]undecane (margin). In various countries, some of these substances have a history of use as folk medicines for purposes such as contraception. Make a model of this compound. How does the cyclopropane ring affect the conformations of the two cyclohexane rings? The cyclohexane rings in cis-decalin itself are capable of (simultaneous) chair-chair inter-conversion (recall Exercise 4-13). Is the same true in tricyclo[5.4.01.3 .01.7]undecane?

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Tricyclo5.4.013 o.7undecane