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Chapter 31: Q.26. (page 1231)

Question: Locate the isoprene units in each compound.

Short Answer

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Answer

Step by step solution

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 尾-carotenecompound, there are eight isoprene units.


尾-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 尾-amyrin, there are six isoprene units.

尾-amyrin

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Most popular questions from this chapter

Draw the products formed when triacylglycerol A is treated with each reagent. Rank compounds A, B and C in order of increasing melting point.

  1. H2O,H+
  2. data-custom-editor="chemistry" H2(excess),data-custom-editor="chemistry" Pd-C鈫�B
  3. H2(1 equiv), Pd-C鈫�C

Question: An isoprene unit can be thought of as having a head and a tail. The 鈥渉ead鈥� of the isoprene unit is located at the end of the chain nearest the branch point, and the 鈥渢ail鈥� is located at the end of the carbon chain farthest from the branch point. Most isoprene units are connected together in a 鈥渉ead-to-tail鈥� fashion, as illustrated. For both lycopene (Problem 31.26), and squalene (Figure 31.9), decide which isoprene units are connected in a head-to-tail fashion and which are not.

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

Question: Draw a stepwise mechanism for the conversion of neryl diphosphate to 伪-pinene, 伪-pineneis a component of pine oil and rosemary oil.

Locate the isoprene units in each compound.

a.

b.

c.

d.
See all solutions

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