Identify and number the substituents.
(a) Assign a number, called a locant, to each substituent to locate its point of attachment to the parent chain.
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(b) If there are two substituents on the same carbon, give both the same number. There must be as many numbers in the name as there are substituents.
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Step 4 Write the name as a single word.
Use hyphens to separate the different prefixes, and use commas to separate numbers. If two or more different substituents are present, cite them in alphabetical order. If two or more identical substituents are present, use one of the multiplier prefixes di-, tri, tetra- and so forth, but don’t use these prefixes for alphabetizing. Full names for some of the examples we have been using follow
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Step 5 Name a complex substituent as though it were itself compound.