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Chapter 25: Q13P (page 1320)

  1. Circle the isoprene units in the following terpenes.
  2. Classify each of these as a monoterpene, diterpene, etc.

Short Answer

Expert verified

b. 伪-farnesene: sesquiterpenes

limonene: monoterpenes

伪-pinene: monoterpenes

zingiberene: sesquiterpenes

Step by step solution

01

Isoprene rule

Terpenoid molecule with two or more isoprene joined to head and tail. Isoprene (2-methyl-1,3-butadiene) is a branched-chain, five carbon units unsaturated hydrocarbon, having two double bonds (C-C). Having formulaCH2=C(CH3)鈭扖贬=颁贬2.

02

Classification

Terpenes classified on the basis of number of isoprene:

(1) 伪-farnesene is monoterpene: two isoprene units

(2) Limonene is sesquiterpenes: three isoprene units

(3) 伪-pinene is diterpenes: four isoprene units

(4) Zingiberene is triterpenes: six isoprene units

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