Organic Chemistry Naming Branched Hydrocarbons 1 st Determine

Organic Chemistry Naming Branched Hydrocarbons 1 st. Determine the longest continuous carbon chain CH 3 CH 3 -CH 2 -CH-CH -CH--CH 2 –CH 3 CH-CH 3 CH 3 -CH 2 -CH-CH 2 –CH 2 -CH 3 CH-CH 3 Use the prefix oct- for 8 carbons in the chain and suffix –aneas only single bonds are between the H & C so, octane

Organic Chemistry Naming Branched Hydrocarbons 2 nd. Add the ending –yl to every group branching off the longest chain (if more than one of the same group add the prefixes) (di=2, tri=3, tetra=4) alphabetically according to –yl group CH 3 CH 3 -CH 2 -CH-CH 2 –CH 3 CH-CH 3 Alkyl groups: 3 methyl groups and 1 ethyl group Alphabetically: ethyl comes before methyl so…. ethyl methyloctane Adding prefixes: none for ethyl, but tri-for the methyl groups so… ethyl trimethyloctane

Organic Chemistry Naming Branched Hydrocarbons 3 rd. Number the longest continuous carbon chain to write the lowest locant possible in the name. 6 ethyl 457 trimethyloctane CH 3 OR 3 ethyl 245 trimethyloctane CH 3 CH 3 -CH 2 –CH 3 3 2 -CH-CH 5 6 4 1 2 7 CH-CH 3 8 CH 3 CH -CH -CH-CH 2 –CH 3 8 3 7 2 6 2 5 4 3 2 CH-CH 3 1 Has the lowest locant! 4 th. Insert the numbers in the name. 3 - ethyl-2, 4, 5 trimethyloctane 5 th. Punctuate the name (insert hyphens and commas).