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naming of benzoic acid molecules

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Size:  6.0 KBFor this molecule, I know that it is called cyclopent-3-enoic acid but I don't get why the double bond would be on the third carbon since there is a carbon on the cooh group. Surely when it gets to the c=c bond, there are 4 carbons?

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    I disagree with your name:

    Cyclopent-3-enecarboxylic acid be what I'd name it.
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    (Original post by Pigster)
    I disagree with your name:

    Cyclopent-3-enecarboxylic acid be what I'd name it.
    Sorry about the mistake, I saw the wrong name on Google. Why is the double bond not on the fourth carbon then since there is a carbon in the cooh group.

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    The ring would be called cyclopentene if nothing were attached. There is a side-chain attached to the ring, which denotes the 1 position on the ring, hence the ene gets a -3-. The naming convention for a carboxylic acid carbon attached directly to a ring is...

    The carboxylic acid carbon is not part of the ring, so isn't carbon number 1 on the ring.
 
 
 
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