Why does 1,3-dibromo-1,3-dimethylcyclobutane have cis- and trans- isomers?

[yeung2743]

I want to know why there are cis- and trans form of 1,3dibromo-1,3-dimethylcyclobutane?

and anybody explain it to me thanks a lot

 

[Nemus]

If you look at the 3d structures it should be fairly obvious
Trans ("other side") to the right, cis (same side") to the left.

 

[wazani]

If you look at the 3d structures it should be fairly obvious
Trans ("other side") to the right, cis (same side") to the left.

and it can't rotate around the axis of the single bond

 

[Nemus]

No, there are two single bonds locking it in a stiff ring so you either have to break a bond or squeeze a methyl group through the center of the ring to interconvert them.

 

[yeung2743]

I understand now
Thx all you three guys ^^