5 Sec Butyl 2 4 Dimethylnonane
This occurs when a substituent is itself branched ie has sub-branching. Such a substituent is called a complex substituent. 5 Butyl 2 4 Dimethylnonane C15h32 Pubchem An example is. . CHCH2CH3 CH CH 8 3-Ethyl-47-dimethylnonane Complex substituents Application of the preceeding four steps allows us to name many alkanes. However in some very complex cases a fifth step is needed.