Chapter 5.2, Problem 5.12P

Interpretation Introduction

Interpretation:

The unsaturation has to be located and how it will be represented in the name of the compound has to be given.

Concept Introduction:

All the molecules have their unique names.  These names must be known in order to communicate.  But remembering all the chemical names is impossible as there are many numbers of molecules.  To avoid this, the IUPAC nomenclature of naming the molecules has to be understood.  By use of this the name of the molecules can be derived from the rules.  Every IUPAC name consist of five parts.  They are,

Stereoisomerism

Substituents

Parent

Unsaturation

Functional Group

Stereoisomerism indicate if the considered molecule has any stereocenters are present (R,S) and if double bond is present are cis/trans.

The groups that are connected to the main carbon chain is known as substituents.

The longest carbon chain is known as the parent.

Unsaturation indicates that if any triple or double bonds are present in the molecule.  If a compound contains a double bond it is named as “-en-” and if a triple bond is present “-yn-” is used.  If a compound contains two double bonds, then it is named as “-dien-”.  If three double bonds are present in the given compound, then it is named as “-trien-”.  This same rule applies for the compound that contains multiple triple bonds also.

Functional group is the one after which the considered compound is being named.  Functional groups determine the chemical property of a compound.  While naming a compound using IUPAC nomenclature, we add suffix to the name of the compound to show what functional group is present in it.  Some of the examples are,

Functional Group	Class of compound	Suffix
	Ester	-oate
	Ketone	-one
	Aldehyde	-al
	Carboxylic acid	-oic acid
	Alcohol	-ol
	Amine	-amine