Chapter 20.6, Problem 12P

Interpretation Introduction

Interpretation:

The two ways that isoprene linkages can be linked head-to-tail to form menthol has to be determined.

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.

Isoprene unit:

  

  

Branched end of isoprene – Head

Unbranched end of isoprene - Tail