Organic Chemistry

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4. Alkanes and Cycloalkanes

Alkyl Groups

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IUPAC naming is awesome because it’s pretty easy to master. But unfortunately there are some non-IUPAC names we need to know for this course. These apply mostly to weird looking substituents. Let's take a look.

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concept

Understanding Non-IUPAC Substituents

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Quick note:"n" stands for normal:)

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Pro Tip:For the butyl groups, you can use the number of substituent carbons attached to it to determine the prefix on the name. (i.e. Butyl with 2 carbons branching off of it is a secondary, or sec-butyl)

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example

Name the following alkane

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Remember to always apply IUPAC rules 1-5 before deciding if a substituent is common or not! Let’s try another. 

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example

Name the following alkane

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Iso, just like cylo and neo should be considered when alphabetizing. However, prefixes such as tert-, tetra-, sec-, tri-, di- and so forth can be ignored

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Awesome. Now you know how to name pretty much any branched alkane. Party time!