Ring isomerism Question

[lan418]

O

ll

/ \

l l

\_ //

 

O

ll

/ \

ll l

\ __ /

 

 

Ok, this is the hexane molecule with the C=O bond on the top. In the first one, there is a double bond near the lower right and a double bond in the second molecule at the middle left. I'm wondering, as far as isomerism is concerned, is this a cis-trans isomer or a structural isomer and why. On my test i put structural, so i dont know if i'm right.

 

Thanks in advance.

[lan418]

sry, tried to draw a cyclohexane on here. the middle didnt get spaced out and evened. it should be a hexagon with the C=O bond at the tip on top of the hexagon and double bonds on the lower right and middle left, on 1st and 2nd model respectively.

[woelen]

This is a structural isomer. In one molecule, there are 2 C-atoms between the double bonds, and in the other molecule there are 3 C atoms between the double bonds. So, these molecules really have different structures.

 

Next time, use the [ code][ /code] tags for the drawing and insert data between these tags. Then, the molecules look as follows:

 

 O
 ll
/  \
l    l
\_//

 O
 ll
/  \
ll   l 
\__/

[lan418]

Yes! i got that right.

 

Ok, ill use the tag next time. Thanks