## Numbering carbon atoms

Marc Farah 3D
Posts: 22
Joined: Wed Sep 21, 2016 2:59 pm

### Numbering carbon atoms

For numbering the carbon atoms for cycloalkanes. Why do we not find the longest chain and start with that as opposed to just counting the ring structure

Alexander Chen 3N
Posts: 36
Joined: Fri Jul 22, 2016 3:00 am
Been upvoted: 1 time

### Re: Numbering carbon atoms

I'm not sure if I am understanding your question, but we do look for the longest chain even if there is a cycloalkane. For example, if there is a decane with a cyclopropane attached to the 2nd carbon, it would be called 2-cyclopropyl-decane.

Let me know if you have more questions or if I misunderstood your question!