Comments on: Table of Functional Group Priorities for Nomenclature

By: _Will

_Will — Wed, 19 Nov 2025 12:16:14 +0000

The written seems to be a fan Harry Potter….

By: James Ashenhurst

James Ashenhurst — Wed, 22 Oct 2025 11:08:28 +0000

In reply to Cesar Ordoñez.

It’s treated as a substituent to the parent chain and the parent chain has the suffix.

So diethyl ether for example has a longest chain of two. The naming becomes ethoxyethane.

methyl propyl ether would be methoxypropane

a more complex example would be 3-methoxypentane
or
1-bromo-2-methoxy-3,3 dimethyl hexane.

By: Cesar Ordoñez

Cesar Ordoñez — Wed, 22 Oct 2025 11:00:31 +0000

What happens with the ether group? Which priority it has? I know that the interfix for it is -oxy- but in which rank does it belong?

By: eldwin cheung

eldwin cheung — Tue, 06 Aug 2024 04:56:14 +0000

i think there is a typo: 4-oxo-pentanoic acid should actually be 4-oxopentanoic acid.
hyphen before pentanoic acid should be removed

By: alice kim

alice kim — Tue, 23 Apr 2024 16:06:50 +0000

thanks, if there are cycloalkyl group, ethyl, and isopropyl group, which one takes the priority to get low number?

By: Viraj K

Viraj K — Tue, 05 Mar 2024 17:18:15 +0000

What will the IUPAC name of this compound be?(— is triple bond, — is double bond and – is single bond)

CH—C-CH₂-CH₂-C–OH

By: James Ashenhurst

James Ashenhurst — Fri, 10 Mar 2023 18:24:06 +0000

In reply to Vaibhav. Lowest locant. 3-hydroxynonan-4-one

By: Vaibhav

Vaibhav — Fri, 10 Mar 2023 15:27:21 +0000

I have a question.
Will lowest locant rule will be prefered or the order of preference of functional group will be preferred. I mean H3CCH2(OH)CHCOCH2CH2CH2CH2CH3.
will be named 3-hydroxynonan-4-one(locant rule followed)
Or 7-hydroxynonan-6-one (order of preference followed)

By: Ammar

Ammar — Mon, 08 Aug 2022 19:03:44 +0000

But if you look at the examples below ''Carefully'' you will notice, numbering is as simple as we're trying to make it. Example: 1-Bromo-3-Methoxypropane. Example*: 1-butoxy-5-chloropentane. Example: 1-Ethoxy-3-iodopropane. Example*: 1-Chloro-3-propoxypropane. Example: 1-Chloro-3-nitropropane Example*: 1-iodo-3-nitropropane *Examples does not contradict the ALPHABETICAL rule.

By: Ammar

Ammar — Sat, 06 Aug 2022 15:00:45 +0000

But if you look at the examples below ''Carefully'' you will notice, numbering isn't as simple as we're trying to make it. Example: 1-Bromo-3-Methoxypropane. Example*: 1-Chloro-5-butoxypentane. Example: 1-Ethoxy-3-iodopropane. Example*: 1-Chloro-3-butoxypropane. Example: 1-Chloro-3-nitropropane Example*: 3-iodo-1-nitropropane *Examples just contradict the ALPHABETICAL rule. I think it depends on the OXIDATION State of the Carbon. 'If a substituent Oxidises the Carbon more than other substituent on the same position, then numbering will start from that substituent which Oxidises more.'