Indicating double bond on alkene

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Chem_Mod
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Indicating double bond on alkene

Postby Chem_Mod » Tue Aug 30, 2011 12:33 am

How do you indicate the location of a double bond on an alkene?
In 2-methyl-1, 3, butadiene, what do the 1 and 3 signify? I understand that it represents the position of the molecules. The 2 means that the methyl is on the second carbon of the butadiene, but what positions are the 1 and 3 referring to?

Chem_Mod
Posts: 17238
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Re: Indicating double bond on alkene

Postby Chem_Mod » Tue Aug 30, 2011 12:34 am

The parent chain should be the longest chain containing both atoms of the double bond, and give the lowest number to the double bond.
In the example you brought, it means that two double bonds are located on carbon atoms 1 and 3. In other words, there is a double bond between carbon 1 and 2, and there is another double bond between carbon 3 and 4.


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