Finding the Main chain

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Jose Avelar
Posts: 10
Joined: Fri Sep 25, 2015 3:00 am

Finding the Main chain

Postby Jose Avelar » Mon Feb 22, 2016 8:12 pm

When counting the carbons for determining what the longest chain is, does it matter which Carbon you start with in determining the longest chain?

Ronald Yang 2F
Posts: 86
Joined: Fri Sep 25, 2015 3:00 am

Re: Finding the Main chain

Postby Ronald Yang 2F » Mon Feb 22, 2016 8:52 pm

Technically yes, since depending on which carbon you start from determines how long it would be. For example, you would want to start on a carbon that is preferably at the "end" of a chain, meaning that you would start counting from a primary carbon (carbon attached to only one carbon).

Srivinay_Irrinki
Posts: 20
Joined: Fri Sep 25, 2015 3:00 am

Re: Finding the Main chain

Postby Srivinay_Irrinki » Mon Feb 22, 2016 8:59 pm

Yes, when determening the main chain, it does matter which carbon you start with. To expand on Ronald's example, consider a molecule that is seven carbons long if you go directly from left to right, but has a branch of 3 carbons on the 5th carbon. In this case, the chain starting with the branch and stretching to the left will be the main chain as it contains 8 carbons. This is why the length of the main chain is dependent on which carbon you start with.


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