Nomenclature of a branched alkane

[![enter image description here](https://i.stack.imgur.com/oczUw.png)](https://i.stack.imgur.com/oczUw.png)


Here I need to give the systematic name of this molecule so I decided to first find the longuest chain of carbons which seems to be the one I put in red. Then I have 2 ethyls at 3 and 4 and I have an isobutyl at 6 so would the name be


3,4-diethyl-6-isobutyldecane ?




The name ‘3,4-diethyl-6-isobutyldecane’ that is proposed in the question is unambiguous and describes the correct structure. However, it corresponds to obsolete IUPAC recommendations.


The retained prefix ‘isobutyl’ was still contained in the [1993 recommendations](http://www.acdlabs.com/iupac/nomenclature/93/r93_682.htm) but is explicitly no longer recommended in the current version of *[Nomenclature of Organic Chemistry – IUPAC Recommendations and Preferred Names 2013 (Blue Book)](http://dx.doi.org/10.1039/9781849733069-fp001).*


According to current IUPAC recommendations, the preferred prefix for the group $\ce{(CH3)2CH-CH2-{}}$ is ‘2-methylpropyl’.


Therefore, the preferred IUPAC name (PIN) for the compound given in the question is 3,4-diethyl-6-(2-methylpropyl)decane.


![3,4-diethyl-6-(2-methylpropyl)decane](https://i.stack.imgur.com/TLtSH.png)


 4

Isobuytl is a trivial name (Although it is very clear what is means, even if not formally correct).


Try:


3,4-diethyl-6-(2-methylpropyl)-decane


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