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Organic Chemistry Naming Branched Hydrocarbons 1st Determine the longest continuous carbon chain CH3CH3 CH3-CH2-CH2-CH-CH -CH--CH2 –CH3 CH-CH3 CH3 CH3 CH3 CH3-CH2-CH2-CH-CH-CH-CH2 –CH2 -CH3 CH-CH3 CH3 Use the prefix oct- for 8 carbons in the chain and suffix –ane as only single bonds are between the H & C so, octane Organic Chemistry Naming Branched Hydrocarbons 2nd 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 CH3CH3 CH3-CH2-CH2-CH-CH-CH-CH2 –CH3 CH-CH3 CH3 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 3rd Number the longest continuous carbon chain to write the lowest locant possible in the name. 6 ethyl 457 trimethyloctane OR 3 ethyl 245 trimethyloctane CH3CH3 CH3-CH2-CH 2 –CH3 3 2-CH-CH-CH-CH 5 6 4 1 2 7CH-CH3 8CH3 CH3CH3 CH -CH -CH -CH-CH-CH-CH2 –CH3 8 3 7 2 6 2 5 4 3 2CH-CH3 1CH3 Has the lowest locant! 4th Insert the numbers in the name. 3- ethyl-2,4,5- trimethyloctane 5th Punctuate the name (insert hyphens and commas).