IUPAC Nomenclature - Problem 3

Description:

Q3. The IUPAC name of the given structure is

Explanation −

• System: cyclohexane (6 −carbon atoms).

• Principal functional group (suffix): alkene thus, ends with ′ − ene′.

• There are two ways of numbering the alkene from either sides of the double bond.

• The numbering in green (structure – I) is correct because the branched carbon or carbon bearing the substituent will receive the lowest numbering. In structure- I, C − 1 has Cl while in structure-II, C − 2 has Cl.

• Since there are two substituents, priority will be assigned alphabetically.

The IUPAC name of the given structure is −

3 − Bromo − 1 − chlorocyclohex − 1 − ene or simply 3 − Bromo − 𝟏 − chlorocyclohexene.