In this video, we're going to talk about the way of naming cycloalkanes. Now we're going to state the rules for naming cyclic alkanes or cycloalkanes, which are very similar to naming alkanes with substituents. Here, our naming convention will focus on the location of each substituent and, because it's a cyclic alkane or cycloalkane, the parent chain is named as a cyclo parent chain. So now that we know the basic naming structure, let's move on to the next video where we start naming different types of cycloalkane compounds.
Naming Cyclic Alkanes - Video Tutorials & Practice Problems
Rules for Naming Cyclic Alkanes Concept 1
Video transcript
Naming Cyclic Alkanes Example 1
Video transcript
Now here in this example question it says, determine the systematic name of the following alkane. So to do that, we're going to employ the following steps. So, step 1, it says, assign a name to the alkane ring. The ring here will serve as the parent, according to its prefixes. Now, you're going to add the prefix 'cyclo,' to the name of the alkane ring, because it's no longer just an alkane, it's a cyclic alkane. So we're going to use 'cyclo.' Now, step 2, you're going to assign names to all the substituents on that ring. Step 3, start numbering the chain from the closest substituent. Now, if there is only one substituent, the location is not necessary. If tied between substituents, compare the next closest substituent; if it's still a tie, number in alphabetical order. From our previous videos in terms of naming alkanes with substituents, we'd use steps 4 to 6. So repeating the same steps from that previous topic. Remember, this has to do with giving a location for the substituents, it has to do with naming substituents alphabetically, and then remember that we use commas to separate numbers from one another, and we use dashes to separate letters and numbers from one another. Now if we take a look here, we have a ring with 1, 2, 3, 4, 5, 6 carbons long in terms of our cyclic alkane. 6 carbons for an alkane is hexane, but it's not just hexane, it's a cyclic hexane. So we use the prefix cyclo. So this is a cyclohexane ring, and attached to it is a 3 carbon alkyl group. Since the bond is at one of the ends of this 3 carbon alkyl group, it represents propyl. Now here, there's only this one substituent, so you don't need to give its numerical location. Because wherever it is located, that's where carbon number 1 will be in this case. So here, we'd say that this is called propylcyclohexane. This will be the name of this particular cyclic alkane with its substituent.
Give a systematic name for the below compound.
1-sec-butyl-3-methylcyclopentane
1-methyl-3-sec-butylcyclopentane
1-butyl-3-methylcyclopentane
1-methyl-3-butylpentane
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