Prioritizing substituents

Moderators: Chem_Mod, Chem_Admin

504594108
Posts: 24
Joined: Fri Sep 25, 2015 3:00 am

Prioritizing substituents

Postby 504594108 » Wed Mar 09, 2016 8:03 pm

When you have multiple substituents, do you prioritize the substituents for numbering by size or by alphabetical order? For example, if you have an ethyl and a propyl substituent on a cyclohexane, which one gets priority in numbering?

Michael Feingold 3B
Posts: 6
Joined: Fri Sep 25, 2015 3:00 am

Re: Prioritizing substituents

Postby Michael Feingold 3B » Wed Mar 09, 2016 8:19 pm

you prioritize whichever one results in the lowest overall numbers in the name and you order the substituents in the name alphabetically

Lily Wei 1D
Posts: 10
Joined: Fri Sep 25, 2015 3:00 am

Re: Prioritizing substituents

Postby Lily Wei 1D » Fri Mar 11, 2016 3:03 pm

For substituents like ethyl and propyl, you would only prioritize alphabetically if there's a tie. Otherwise just number them to the lowest number. But for halogens like Cl or Br, you would prioritize by size but still list alphabetically in the name.


Return to “*Alkanes”

Who is online

Users browsing this forum: No registered users and 0 guests