Naming Ketones - Video Tutorials & Practice Problems
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1
concept
Rules for Naming Ketones
Video duration:
39s
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Now recall that ketones possess a carbonyl carbon connected to 2 carbon atoms. Now, here the set of rules for naming ketones are similar to those used for naming alcohols. Here though, the modifier, the ending of e is changed to 1. And when we talk about the naming convention, we still have to give the locations of different substituents. We then have to give the location of the carbonyl group that is part of the parent chain, and then remember that we're doing a modification to the 'e' ending to 1. These are the keys to naming any key tones that we're going to see.
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example
Naming Ketones Example
Video duration:
2m
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Here it says, provide the formal name for the ketone shown. Now to do that we're going to use the following steps. Step 1 is, find the longest carbon chain, which represents our parent chain, and assign name according to the prefixes and the modifier. Now the parent chain should include the carbonyl group. So remember your carbonyl carbon or carbonyl group is this, c double bond o. And have greater number of carbons. If a tie between longest chain, choose chain with more substituents. If we take a look here, our longest carbon chain, would be this portion here. Now assign name to all substituents for step 2. Our substituent here would be this carbon that's branching off of the main chain, This would be a methyl group. Step 3. Start numbering the chain from the end closest to the carbonyl carbon. So we'd have to start numbering from this end. 12345678. If a tie, the number from the end closest to the next substituent. If still a tie, number in alphabetical order in terms of the substituents. And then here, assign location to the carbonyl carbon. The carbonyl carbons on carbon number 2. Alright. And then we repeat steps 4 to 6, and these are from previous naming topics. Mainly, if we're looking at alkanes with substituents, that's where we're coming up with these rules or steps 4 to 6. If you haven't watched that video, make sure you go back and take a look. Because in it, we talk about our substituents. They're written at the beginning of the name, we have to give their location, numerical location. And if there's multiple substituents, we have to name them alphabetically. So here if we take a look, we're gonna say our substituent is on Carbon 5, so it's 5 Methyl. The carbonyl carbon is on Carbon 2, so 2. 8 carbons is but we change the e ending to 1. So it becomes 2 octanone. So this would be the name of this particular ketone. 5 methyl 2 octanone.
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Problem
Problem
Provide the systematic name for the following ketone.
A
4,4-dichloro-2-hexanone
B
3,3-dichloro-2-hexanone
C
4,4-dichloro-5-hexanone
D
3,3-dichloro-5-hexanone
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Problem
Problem
Which of the following compounds represent 2,4−dimethyl−3−pentanone?