Vinylic Coupling (cis/trans) — Using J to Infer Alkene Geometry: Interpretation + Common Traps

Some Orgo II classes test that vinylic coupling constants differ: trans (larger J) vs cis (smaller J). Use as an advanced stereochemistry clue.

• Reaction: Vinylic Coupling (cis/trans) — Using J to Infer Alkene Geometry
• What it does: Some Orgo II classes test that vinylic coupling constants differ: trans (larger J) vs cis (smaller J). Use as an advanced stereochemistry clue.
• Typical reagents: 1H NMR (analysis; vinylic coupling J values)
• Key intermediate: Varies / context-dependent
• Driving force: Formation of more stable bonds / products
• Exam type: Interpret data
• Exam type: Identify functional groups
• Exam type: Structure constraints