3
$\begingroup$

I assumed this: http://www.chemspider.com/Chemical-Structure.12491.html?rid=222625d4-811c-4b07-b263-8930fafa831a

to be 1-phenylbut-4-ene Where is the priority here? No source I know of tells me of where the priority of the phenyl group lies.

It is wrong. The book states it is 4-PhenylBut-1ene.

What is the priority of the phenyl group?

Improve this question
$\endgroup$

1 Answer 1

Reset to default
4
$\begingroup$

enter image description here

For preferred IUPAC names, the ring is preferred to the chain.
Therefore, the preferred IUPAC name for the given structure is but-3-en-1-ylbenzene.

However, the context may favour the chain, so that, for example, an unsaturated acyclic structure may be recognized.

When one double bond is present, an unbranched alkene is named by changing the ending to ‘ene’. The double bond is assigned the lower locant possible, which is placed immediately in front of the ending ‘ene’. When several structural features appear, low locants are assigned to ‘ene’ endings before detachable alphabetized prefixes.
Therefore, a correct name for the given structure is 4-phenylbut-1-ene.

Improve this answer
$\endgroup$
0

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.