B-carotene

Introductory Chemistry For Today
8th Edition
ISBN:9781285644561
Author:Seager
Publisher:Seager
Chapter11: Organic Compounds: Alkanes
Section: Chapter Questions
Problem 11.72E
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Locate the isoprene units in attached compound.

B-carotene
Transcribed Image Text:B-carotene
Expert Solution
Introduction

β-Carotene is a reddish-orange colored organic pigment found in diverse members of the plant kingdom. It is a terpenoid which is biologically synthesized from 8 isoprene units.

Isoprene

A single unit of isoprene looks like the following:

Chemistry homework question answer, step 2, image 1

There are two modes of linkage of two isoprene units in β-carotene.
1,4 Linkage, in which C-1 of one isoprene unit is linked to C-4 of another unit.

Chemistry homework question answer, step 2, image 2
4,4 Linkage, is the one where C-4 of one isoprene unit is linked to C-4 of another unit.

Chemistry homework question answer, step 2, image 3
1,1 linkage also exists where C-1 of one isoprene unit is linked to C-1 of another unit but is not found in β-carotene.

 

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