[Bassel]

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

[Archer]

If there are substituents within the group then systematic names must be followed to derive the name.

[Archer]

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?

[Bassel]

thanks for your help

[Bassel]

why isn't the ramification on carbon 6 considered iso? also at carbon 4? i am not understanding iso naming very we'll

[Archer]

How would you have named this?

[kriggy]

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.

[Archer]

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,