Why Are These Ring Structures Considered Diastereomers?

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SUMMARY

The ring structures discussed are classified as diastereomers due to their geometric configuration, specifically as cis-trans isomers. Despite the presence of a plane of symmetry and the absence of chiral centers, these structures exhibit different spatial arrangements, which qualifies them as diastereomers. Current classifications recognize geometrical isomers as a subset of diastereomers, affirming that chiral atoms are not a prerequisite for diastereoisomerism.

PREREQUISITES
  • Understanding of diastereomers and their characteristics
  • Knowledge of cis-trans isomerism
  • Familiarity with geometric isomers
  • Basic concepts of molecular symmetry
NEXT STEPS
  • Research the classification of diastereomers in organic chemistry
  • Study the principles of geometric isomerism in cyclic compounds
  • Explore the role of symmetry in molecular structures
  • Learn about the differences between diastereomers and enantiomers
USEFUL FOR

Chemistry students, organic chemists, and anyone interested in stereochemistry and molecular structure analysis.

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Please post this type of questions in HW section using the template.
Could someone explain to me why the ring structures in this photo are diastereomers? From looking at them, I see a plane of symmetry, and no chiral centers so I'm unsure how they're diastereomers without have R/S characteristics
 

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They are cis-trans or geometrical isomers. I believe these days geometrical isomers are classified as a subset of diastereomers. Chiral atoms are not necessary for diastereoisomerism.
 

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