C8H16 Line Structure

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Aleck Sun 1J
Posts: 46
Joined: Fri Sep 25, 2015 3:00 am

C8H16 Line Structure

Postby Aleck Sun 1J » Sat Feb 27, 2016 1:34 am

In Wednesday's lecture, Dr. Casey did an example of drawing the line structure of C8H16. She drew it as a cyclopentane with an isopropyl substituent with it. How did she know that it was a cyclopropane with substituents instead of a cyclooctane ring with no substituents? If the reason is because cyclopentane and cyclohexane are most stable, then why wouldn't it be a cyclohexane?

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

Re: C8H16 Line Structure

Postby Ronald Yang 2F » Sat Feb 27, 2016 12:08 pm

There are many ways you can draw C8H16. Cyclopentane with an isopropyl substituent is one form, while cyclooctane is another. Like she did in lecture, when given a formula, there could possibly be more than one way to draw the structure. Both are correct ways to exemplify C8H16. With regard to if one occurs more often than the other, I would assume cyclooctane because it's simply a ring structure, as opposed to isopropylcyclopentane as a ring structure with a substituent. I think she used that example simply to show an example of C8H16 or an example of a structure with an isopropyl substituent.

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