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Chapter 31: Question 31.17 (page 1256)

Locate the isoprene units in each compound.

a.

b.

Short Answer

Expert verified

Answer

a.

b.

Step by step solution

01

Step-by-Step SolutionStep 1: Isoprene units

Isoprene units are a carbon chain containing five carbon atoms and C-C double bonds. One isoprene unit has a formula CH2=C(CH3)-CH=CH2.For example, diterpenoids have four isoprene units.

02

Isoprene units in α-pinene

A α-pineneis a monoterpene having two isoprene units and is shown as:

Isoprene units inα-pinene

03

Isoprene units in humulene.

A humulene is a sesquiterpene having three isoprene units and is shown as:

Isoprene units in humulene

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Most popular questions from this chapter

Question: Draw a stepwise mechanism for the conversion of neryl diphosphate to α-pinene, α-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·THF;[2]H2O2,-OH

Draw a stepwise mechanism for the following reaction.

Locate the isoprene units in each compound.

a.

b.

c.

d.

Question: The biosynthesis of lanosterol from squalene has intrigued chemists since its discovery. It is now possible, for example, to synthesize polycyclic compounds from acyclic or monocyclic precursors by reactions that form several C-C bonds in a single reaction mixture.

  1. Draw a stepwise mechanism for the following reaction.
  2. Show how X can be converted to 16, 17-dehydroprogesterone. (Hint: See Figure 24.5 for a related conversion.
See all solutions

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