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How do you name this compound?

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1 Answer
May 27, 2018

Answer:

The name is (#E#)-3-carboxypenta-1,3-diene.

Explanation:

The "new" (2013) IUPAC rules give chain length priority over functional groups.

Structure

The longest chain contains five carbon atoms, so the base name is
penta-1,3-diene.

There is a #"COOH"# group on #"C3"#, so the name becomes
3-carboxypenta-1,3-diene.

Finally, the #"C3=C4"# double bond has the #E"# configuration because the highest-priority groups (carboxy and methyl) are on opposite sides of the bond.

The IUPAC name is (#E#)-3-carboxypenta-1,3-diene.