Question about chemical nomenclature

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The discussion centers on the existence of cis and trans forms of 1,3-dibromo-1,3-dimethylcyclobutane. The distinction is clarified through the examination of 3D structures, where the trans configuration places substituents on opposite sides, while the cis configuration has them on the same side. It is noted that the molecule cannot rotate around the axis of the single bonds due to the rigidity of the cyclobutane ring, which requires breaking a bond or forcing a methyl group through the ring to interconvert between the two forms. The participants express gratitude for the clarification provided.
yeung2743
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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
 
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If you look at the 3d structures it should be fairly obvious
Trans ("other side") to the right, cis (same side") to the left.
 

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Nemus said:
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
 
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.
 
I understand now
Thx all you three guys ^^
 
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