Question

Draw the structural formula of (3e,5z)-5-ethyl-3,5-nonadiene. an alternative name for this compound is (3e,5z)-5-ethylnona-3,5-diene, which follows the rules outlined in the 1993 iupac recommendations.

Answer 1

The IUPAC naming of compounds follow a set of rules. First, find the longest carbon chain and number them. As shown in the picture, the longest chain has 9 carbons. In the 3rd and 5th carbon atoms, there is a double bond for each. So, the parent chain is named as 3,5 - nonadiene, 'di' because there are two double bonds. Moreover, at the 5th carbon, there is a branching chain of two carbons (ethyl). Hence, its IUPAC name is: (3e,5z)-5-ethyl-3,5-nonadiene.