Question

The IUPAC name of cinnamaldehyde is:

• A. ($2E$)-$3$-phenylprop-$2$-enal
• B. ($2Z$)-$1$-phenylprop- $1$-enal
• C. ($2E$)-$1$-phenylprop-$2$-enal
• D. ($2Z$)-$3$- phenylprop-$1$-enal

Answer 1

The correct option is A ($2E$)-$3$-phenylprop-$2$-enal

The structure of cinnamaldehyde is as follows:
The IUPAC name is ($2E$)-$3$-phenylprop-$2$-enal. (The notation $E$ is used as the two groups on the double bond are on the opposite side).