Organic Chemistry
Organic Chemistry
8th Edition
ISBN: 9781305580350
Author: William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote
Publisher: Cengage Learning
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Chapter 5, Problem 5.29P
Interpretation Introduction

Interpretation:

Structural formula of vitamin A has to be drawn showing the four isoprene units linked by head-to-tail and cross-linked at one point forming vitamin A.

Concept Introduction:

Terpenes are made by joining five-carbon units, usually in a head to tail-fashion.

Isoprene unit:

Organic Chemistry, Chapter 5, Problem 5.29P , additional homework tip  1

Organic Chemistry, Chapter 5, Problem 5.29P , additional homework tip  2

Branched end of isoprene – Head

Unbranched end of isoprene - Tail

Cross-link is a type of bond that links polymer chains with one another via covalent bond.

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Pyrethrin II and pyrethrosin are two natural products isolated from plants of the chrysanthemum family. Pyrethrin II is a natural insecticide and is marketed as such. Q, Show that the bicyclic ring system of pyrethrosin is composed of three isoprene units.
Propose structures for two constitutional isomers of cyclopentene that do not contain a ring.
(a) Show the isoprene units in each of the following terpenes.(b) Classify each as a monoterpene, sesquiterpene, terpene,etc.
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