Consider reagents like peroxides which favor radicals, solvent and light conditions, and whether the substrate better stabilizes a radical or an ionic intermediate.
Think about it like choosing between two kinds of helpers: one who carries charge and one who carries an unpaired electron. Peroxides and ultraviolet light tend to make the unpaired electron helper, so those conditions push reactions toward radical pathways. Polar solvents and strong acids or bases help form positive or negative charges, so those conditions favor ionic pathways. Also look at the substrate: a tertiary carbon or a resonance-stabilized center often stabilizes a radical or a carbocation differently, so whichever intermediate is more stable usually forms more easily.
Students often assume peroxides always mean radicals, but sometimes polar conditions or strong nucleophiles override that and produce ionic routes, so check all reaction conditions and the whole reagent set. Another common mistake is thinking solvent polarity only affects ionic pathways, but solvents can also affect radical cage effects and propagation steps, so consider solvent effects broadly. A short practical tip is to list every reagent, light source, and solvent, then compare which intermediate each condition stabilizes and predict the dominant pathway.
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Predict Ionic vs Radical Pathways
- Look for peroxides and UV light
- Use polar solvents for ionic paths
- Strong acids or bases favor ions
- Check substrate radical stability
- Prefer resonance for ionic stabilization
Common Mistakes Predicting Reaction Pathways
- Assuming peroxides always give radicals
- Overlooking other reagents that favor ions
- Ignoring solvent effects on radicals
ionicmechanisms, radicalreactions, reactionpathways, organicchemistry, mechanismprediction, peroxides, solventeffects, substratestability, lightinitiated, carbocationvsradical
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