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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

Treatment of cholesterol with mCPBA results in formation of a single epoxide A, with the stereochemistry drawn. Why isn鈥檛 the isomeric epoxide B formed to any extent?

Locate the isoprene units in each compound.

a.

b.

c.

d.

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

Draw the products formed when cholesterol is treated with each reagent. Indicate the stereochemistry around any stereogenic centers in the product.

  1. CH3COCl
  2. H2,Pd-C
  3. PCC
  4. oleicacid,H+
  5. [1]BH3路THF;[2]H2O2,-OH

Draw the enantiomer and any two diastereomers of cholesterol. Does the OH group of cholesterol occupy an axial or equatorial position?
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