mCPBA Epoxidation Stereochemistry: What Exams Actually Test

Deep dive into mCPBA epoxidation stereochemistry: stereospecificity (cis→cis, trans→trans), face selectivity, racemic vs single product cases, and common distractors.

  • Stereospecific rule: cis alkene → cis epoxide; trans alkene → trans epoxide
  • Face approach: If two faces are equivalent → racemic; if not → major diastereomer from less hindered face
  • No intermediates: Concerted mechanism locks stereochemistry
  • Common test format: “Draw the major product(s)” with wedges/dashes
  • Exam type: Stereochemistry
  • Exam type: Predict the major product
  • Exam type: Failure modes / distractors

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