Alkane name

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Cindy Flores 2C
Posts: 27
Joined: Wed Sep 21, 2016 2:59 pm

Alkane name

Postby Cindy Flores 2C » Tue Mar 07, 2017 11:50 am

What is the name of CH3CH2CH(CH3)CH2CH2CH2CH3?

Nick_Kopooshian_3C
Posts: 12
Joined: Fri Jul 22, 2016 3:00 am

Re: Alkane name

Postby Nick_Kopooshian_3C » Tue Mar 07, 2017 11:51 am

wonderful question. It's 3-methylheptane

Paul Sedaros 1B
Posts: 23
Joined: Fri Sep 25, 2015 3:00 am

Re: Alkane name

Postby Paul Sedaros 1B » Tue Mar 07, 2017 12:00 pm

Since there are 7 carbons in a chain (the carbon in the parenthesis is a substituent), we know the chain is a heptane. Now, the substituent only contains one carbon, so therefore it is a methyl group. If we go from right to left, we get 5-methyl-heptane, but from left to right, we get 3-methyl-heptane. Using the rule when there is one substituent, we put the lowest number onto this substituent, so the answer is 3-methyl-heptane.

Patrick Ricaflanca 2H
Posts: 21
Joined: Sat Jul 09, 2016 3:00 am

Re: Alkane name

Postby Patrick Ricaflanca 2H » Tue Mar 07, 2017 9:33 pm

I think if you're having trouble identifying the parent chain, you can just count all the C's outside the parentheses, then consider the one in parentheses the subsituent of the adjacent C atom.


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