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Chapter 31: Q.26. (page 1231)

Question: Locate the isoprene units in each compound.

Short Answer

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01

Isoprene units

Isoprene units are compounds with a formula CH2=C(CH3)-CH=CH2 consisting of double bonds and five carbons. The simplest ones are the monoterpenes containing two isoprene units.

02

Isoprene units in each compound

a. In the neral compound, there are two isoprene units.

neral

b. In the carvone compound, there are two isoprene units.

carvone

c. In the lycopene compound, there are eight isoprene units.

lycopene


d. In the β-carotenecompound, there are eight isoprene units.


β-carotene

03

Isoprene units in each compound

e. In the patchouli alcohol compound, there are three isoprene units.

patchouli alcohol

f. In the periplanone B compound, there are three isoprene units.

periplanone B


g. In a dextropimaric acid, there are four isoprene units.

dextropimaric acid


h. In β-amyrin, there are six isoprene units.

β-amyrin

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Most popular questions from this chapter

Treatment of cholesterol with mCPBA results in formation of a single epoxide A, with the stereochemistry drawn. Why isn’t the isomeric epoxide B formed to any extent?

One component of lanolin, the wax that coats sheep’s wool, is derived from cholesterol and stearic acid. Draw its structure, including the correct stereochemistry of all stereogenic centers.

Question: Locate the isoprene units in biformene, a component of amber, and classify biformene as a monoterpene, sesquiterpene etc.

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Question: Classify each terpene and terpenoid in Problem 31.26 (e.g., as a monoterpene, sesquiterpene, etc.).
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