The isoprene units has to be marked in lycopene and β-carotene . Concept Introduction: Terpenes are made by joining five-carbon units, usually in a head to tail-fashion. Monoterpenes are those terpenes with two isoprene units-have 10 carbons, sesquiterpenes have 15 carbons, diterpenes have 20 carbons, triterpenes have 30 carbons and tetraterpenes have 40 carbons. Isopentenyl pyrophosphate is the five-carbon compound used for the biosynthesis of terpenes. According to the isoprene rule, the isoprene units are terpenoids joined by head to tail linkage or 1-4-linkage.

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Chapter 25.7, Problem 14P

Interpretation Introduction

Interpretation:

The isoprene units has to be marked in lycopene and β-carotene.

Concept Introduction:

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

Monoterpenes are those terpenes with two isoprene units-have 10 carbons, sesquiterpenes have 15 carbons, diterpenes have 20 carbons, triterpenes have 30 carbons and tetraterpenes have 40 carbons.

Isopentenyl pyrophosphate is the five-carbon compound used for the biosynthesis of terpenes.

According to the isoprene rule, the isoprene units are terpenoids joined by head to tail linkage or 1-4-linkage.

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