(c) The structures of lycopene, beta-carotene and retinol are shown below. Lycopene Beta-carotene H,C CH CH CH OH Retinol (vitamin A) CH3 Using appropriate reaction mechanisms: (i) Show how lycopene is converted into beta-carotene. (ii) Briefly explain how retinol is formed from beta-carotene.

(c) The structures of lycopene, beta-carotene and retinol are shown below. Lycopene Beta-carotene H,C CH CH CH OH Retinol (vitamin A) CH3 Using appropriate reaction mechanisms: (i) Show how lycopene is converted into beta-carotene. (ii) Briefly explain how retinol is formed from beta-carotene.

Organic Chemistry

9th Edition

ISBN:9781305080485

Author:John E. McMurry

Publisher:John E. McMurry

Chapter22: Carbonyl Alpha-substitution Reactions

Section22.7: Alkylation Of Enolate Ions

Problem 11P: Draw a resonance structure of the acetonitrile anion, -: CH2CN, and account for the acidity of...

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Concept explainers

Aromatic Compounds

Aromatic organic compound or aromatic system is an important class of hydrocarbons under the branch of organic chemistry. Aromatic compounds are also called arenas. The definition of aromatic organic compounds can be stated as a class of organic compounds with a planar cyclic ring of atoms bonded through alternated single and double bonds. Due to these alternating bonds, a peculiar feature termed as ‘resonance’, that is, delocalization of pi electrons or the electrons is shared within the atoms of the ring which are present in the aromatic compounds. The word ‘aromatic’ includes a Greek word ‘aroma’ which means smell, indicating that they were named as such due to the sweet odor they produce. Many well-known flavors such as vanilla, cinnamon, and few scents from flowers are extracted from aromatic compounds. Benzene with chemical formula C6H6 is a very common aromatic compound that contains six atoms of carbon held in the cyclic ring of alternate double bonds. It is also to be noted that not all aromatic compounds contain benzene ring. This can be explained by Huckel’s rule.

Question

(c) The structures of lycopene, beta-carotene and retinol are shown below.
Lycopene
Beta-carotene
H3C CH;
CH3
CH3
OH
Retinol (vitamin A)
CH3
Using appropriate reaction mechanisms:
(i)
Show how lycopene is converted into beta-carotene.
(ii)
Briefly explain how retinol is formed from beta-carotene.

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