Find the parent hydrocarbon.
(a) Find the longest continuous chain of carbon atoms in the molecule, and use the name of that chain as the parent name. The longest chain may not always be apparent from the manner of writing; you may have to “turn corners.”
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(b) If two different chains of equal length are present, choose the one with the larger number of branch points as the parent.
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Number the atoms in the main chain.
(a) Beginning at the end nearer the first branch point, number each carbon atom in the parent chain.
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The first branch occurs at C3 in proper system of numbering, not at C4.
(b) If there is branching an equal distances away from both ends of the parent chain begin numbering at the end nearer the second branch point.
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