Chapter 30
Basic Principles of Organic Chemistry · 3 exercises
Problem 1
a. Write out all of the possible carbon skeletons for acyclic terpene and sesquiterpene hydrocarbons that follow the isoprene rule. Do not consider double-bond position isomers. b. Do the same for monocyclic terpenes with a six-membered ring.
5 step solution
Problem 2
The terpene known as alloöcimene \(\left(\mathrm{C}_{10} \mathrm{H}_{16}\right)\) shows \(\lambda_{\max }\) at \(288 \mathrm{~nm}\) and gives among other products 1 mole of 2-propanone and 1 mole of ethanal on ozonization. What is a likely structure for alloöcimene? Show your reasoning.
4 step solution
Problem 5
a. Nerol and geraniol cyclize under the influence of acid to yield \(\alpha\) -terpineol. How could the relative ease of cyclization of these alcohols, coupled with other reactions, be used to establish the configurations at the double bond of geraniol, nerol, geranial, and neral? Write a mechanism for the cyclizations. b. Acidic cyclization of optically active linaloöl produces optically active \(\alpha\) -terpineol. Explain how this can come about.
6 step solution