5- Ethyl-3-methyloctane

When several different alkyl groups are attached to the parent compound, list them in alphabetical order (e.g., ethyl before methyl in 3-ethyl-4-methyloctane). Prefixes are not included in alphabetical ordering (ethyl comes before dimethyl). 

Ethyl-4-methyloctane (a chiral alkane) Linalool (a pleasant-smelling oil obtained from oranges)... 

Alcohol 43 (entry 31) is a starting material for the synthesis of (R)-(+)-[VCD( )984]-4-ethyl-4-methyloctane 51, a cryptochiral saturated hydrocarbon with a quaternary chirality center, as will be discussed in section 55.3.4 (see Figure 55.26). Enantiopure alcohol (l/ ,2/ )-(—)-43 was obtained by the CSDP acid method, and its AC was unambiguously determined by X-ray crystallography." However, the MaNP acid method is better than the CSDP acid method in this case because of more effective HPLC separation of diastereomeric esters (see the result in section 55.3.4). 

Fujita T, Obata K, Kuwahara S, Miura M, Nakahashi A, Monde K, Decatur J, Harada N. (/f)-(+)-[VCD(+)945]-4-Ethyl-4-methyloctane, the simplest chiral saturated hydrocarbon with a quaternary stereogeiuc center. Tetrahedron Lett. 2007 48 4219-4222. 

Ethyl-4-methylbenzene Ethylbenzene Ethylcyclobutanone Ethyl-dimethylcyclohexane Ethylhexanol Ethyl-methyloctane Formaldehyde... 

The compound becomes an octane derivative that bears a C 3 methyl group and a C 4 ethyl group When two or more different substituents are present they are listed m alphabetical order in the name The lUPAC name for this compound is 4 ethyl 3 methyloctane... 

In case there is more than one alkyl substituent present in the structure then the substituents are named in alphabetical order, numbering again from the end of the chain nearest the substituents. The structure in following figure is 4-ethyl-3-methyloctane and not 3-methyl-4-ethyloctane. 

As indicated in the discussion of the reaction of n-pentane, ethylation of n -heptane took place chiefly at a penultimate carbon atom, yielding 3-methyloctane as the principal product only small amounts of 3- and... 

The product formed in largest amount by the hydrochloric acid-promoted and peroxide-induced reaction of isopentyl chloride with ethylene was also that formed by alkylation at the tertiary carbon atom, namely 1-chloro-3,3-dimethylpentane (Ig.) (Expt. 25). The remaining constituents of the reaction product were all obtained in very minor amount and were all alkyl chlorides. Among these were 4-chloro-2-methylhexane (y), 1-chlorohexane (formed by telomerization) and some chlorononanes including 5-chloro-3,3-dimethyl-heptane (3 ) formed by ethylation of 12, 4-chloro-2-methyloctane (15) and l-chloro-3-methyloctane (IT). ... 

The longest chain has eight carbon atoms in it. The systematic name of the compound is 4-ethyl-5-methyloctane. 

If more than one substituent is attached to the parent hydrocarbon, the chain is numbered in the direction that will result in the lowest possible number in the name of the compound. The substituents are listed in alphabetical (not numerical) order, with each substituent getting the appropriate number. In the following example, the correct name (5-ethyl-3-methyloctane) contains a 3 as its lowest number, while the incorrect name (4-ethyl-6-methyloctane) contains a 4 as its lowest number ... 

Using the same principles illustrated above, this compound is named 3-ethyl-6-isopropyl-3-methyloctane. 

The correct lUPAC name is 5-ethyl-3-methyloctane. Note the alphabetical order of substituents. 

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