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Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: ve_90 on November 08, 2023, 10:57:55 AM

Title: IUPAC name
Post by: ve_90 on November 08, 2023, 10:57:55 AM

What's the correct name of this compound?
A) 3-methyl-6-(1-methylethyl)nonane
B) 6-(1-methylethyl)-3-methylnonane

I think the first one is correct but I'm not so sure because I don't remember the IUPAC rules.
Our teacher always calls this substituent "isopropyl".

Title: Re: IUPAC name
Post by: Hunter2 on November 08, 2023, 11:13:23 AM

The first one is correct. Smaller number first and alphabetical  order. But also Isopropyl is still valid.

Title: Re: IUPAC name
Post by: ve_90 on November 08, 2023, 01:36:58 PM

Thank you very much. For the same reasons 4-(1-chloroethyl)-2-iodo-3-methyloctane is correct for the following compound?

Title: Re: IUPAC name
Post by: Hunter2 on November 08, 2023, 01:42:55 PM

Yes, I would say so

Title: Re: IUPAC name
Post by: rolnor on November 08, 2023, 05:09:20 PM

Isopropyl is not correct I think, isopropanol should be 2-propanol

Title: Re: IUPAC name
Post by: Aldebaran on November 08, 2023, 05:50:42 PM

Our UK exam boards prefer propan-2-ol

Title: Re: IUPAC name
Post by: Hunter2 on November 08, 2023, 10:57:56 PM

Both is valid

https://www.quora.com/Is-isopropyl-side-chain-an-IUPAC-name-or-a-common-name

Title: Re: IUPAC name
Post by: rolnor on November 09, 2023, 04:17:41 AM

Valid, not prefered. The deffinition is that its a alkyl chain that is branched, isopropyl is not branched. They accept it because its so common.