Question 11.1: Name the following alkenes and alkyne using I.U.P.A.C. nomen...
Name the following alkenes and alkyne using I.U.P.A.C. nomenclature.
To determine the I.U.P.A.C. name, identify the parent chain, number it to give the lowest possible positions for the carbon or carbons with the double bonds, and finally, identify and number each functional group.
The common name of this molecule is isoprene. It is the major building block for many important biological molecules, including cholesterol and other steroids, β-carotene, and vitamins A, D, E, and K.
Longest chain containing the double bond: butene
Position of the double bond: 1,3-butadiene
Substituents: 2-methyl
Name: 2-Methyl-1,3-butadiene
Longest chain containing the double bond: octene
Position of double bond: 3-octene (not 5-octene)
Substituents: 3-methyl and 4-propyl
Name: 3-Methyl-4-propyl-3-octene
Longest chain containing the triple bond: hexyne
Position of triple bond: 3-hexyne (must be!)
Substituents: 2,2-dimethyl
Name: 2,2-Dimethyl-3-hexyne