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

Isoprene units in伪-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

Draw a stepwise mechanism for the following conversion, which forms camphene. Camphene is a component of camphor and citronella oils.

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?

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

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