Chemical Forums

Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: Bassel on October 22, 2013, 12:41:08 PM

Title: Nomenclature
Post by: Bassel on October 22, 2013, 12:41:08 PM
There is an alkane compound that has a ramification but when we wrote the name it wasn't written with the prefix "iso" I still remember that the professor said something about when do we consider a branch iso and when not but i totally forgot. Anyone Has an idea? thank you
Title: Re: Nomenclature
Post by: Archer on October 22, 2013, 01:52:28 PM
If there are substituents within the group then systematic names must be followed to derive the name.

Title: Re: Nomenclature
Post by: Archer on October 22, 2013, 02:31:58 PM
There is an alkane compound that has a ramification but when we wrote the name it wasn't written with the prefix "iso" I still remember that the professor said something about when do we consider a branch iso and when not but i totally forgot. Anyone Has an idea? thank you

Could you provide your example?
Title: Re: Nomenclature
Post by: Bassel on October 22, 2013, 03:27:35 PM
thanks for your help
Title: Re: Nomenclature
Post by: Bassel on October 22, 2013, 03:31:08 PM
why isn't the ramification on carbon 6 considered iso? also at carbon 4? i am not understanding iso naming very we'll
Title: Re: Nomenclature
Post by: Archer on October 22, 2013, 04:19:41 PM
How would you have named this?
Title: Re: Nomenclature
Post by: kriggy on October 23, 2013, 01:42:34 AM
why isn't the ramification on carbon 6 considered iso? also at carbon 4? i am not understanding iso naming very we'll
http://www.acdlabs.com/iupac/nomenclature/79/r79_36.htm

Archer basicly said that already:
The following names are retained for unsubstituted hydrocarbons only:
Isobutane   
Isopentane   
Neopentane   
Isohexane   
The link might help you understanding how to name your compounds.
Title: Re: Nomenclature
Post by: Archer on October 23, 2013, 02:39:55 AM

The following names are retained for unsubstituted hydrocarbons only:
Isobutane   
Isopentane   
Neopentane   
Isohexane   


Other examples, approved by IUPAC include:

Isopropyl,
sec-butyl,
tert-butyl,
tert-pentyl,