Provide the correct name for the following molecules.

Question:

Provide the correct name for the following molecules.

IUPAC Nomenclature:

Esters are organic compounds having {eq}\left( { - {\rm{COOR}}} \right) {/eq} functional group. Their systematic naming is done on the basis of the respective carboxylic acid name. The alkyl group acting as a substituent is named by using suffix -yl and the naming of esters is done by using suffix -oate in place of -oic acid.

Answer and Explanation:


1

The given compound consists of an ester functional group. The longest chain has five atoms of carbon having double bonds on second and fourth carbon atoms. The vinyl group {eq}\left( { - {\rm{CH}} = {\rm{C}}{{\rm{H}}_{\rm{2}}}} \right) {/eq} is attached to the oxygen of ester group. Therefore, the correct name of the molecule is vinyl penta-2,4-dienoate.

2

The given compound consists of an ester functional group. The longest chain has five atoms of carbon having double bond on second carbon atom. Also, two methyl groups are present on second and fourth carbon atoms and acetyl group {eq}\left( {{\rm{C}}{{\rm{H}}_3} - {\rm{CO}}} \right) {/eq} is present on third carbon atom. The butyl group having double bond on second carbon atom is attached to the oxygen of ester group. Therefore, the correct name of the molecule is (but-2-en-2-yl) 3-acetyl-2,4-dimethylpent-2-enoate.

3

The given compound consists of an ester functional group. The longest chain containing ester group has five atoms of carbon having double bonds on second and fourth carbon atoms. Also, one methyl and one methoxy group are present on second and third carbon atoms. The pentyl group having double bond on second carbon atom and methyl group on third carbon atom is attached to the oxygen of ester group through its second carbon atom. Therefore, the correct name of the molecule is (3-methyl pent-2-en-2-yl) 3-methoxy-2-methylpenta-2,4-dienoate.

4

The given compound consists of an ester functional group. The longest chain containing ester group has seven atoms of carbon having double bond on second carbon atom. Also, 1-hydroxypropan-2-ylidene is present on fourth carbon atom. The pentyl group having double bond on first carbon atom with two methyl groups on second and third carbon atoms and oxo group on fourth carbon atom is attached to the oxygen of ester group. Therefore, the correct name of the molecule is (2,3-dimethyl-4-oxopent-1-enyl) 4-(1-hydroxypropan-2-ylidene)hept-2-enoate.


Learn more about this topic:

Naming Carboxylic Acids Using IUPAC Nomenclature
Naming Carboxylic Acids Using IUPAC Nomenclature

from Chemistry 304: Organic Chemistry II

Chapter 5 / Lesson 5
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