Etard Reaction (ArCH₃ + CrO₂Cl₂ / CS₂ → ArCHO (toluene to benzaldehyde))
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ArCH₃ + CrO₂Cl₂ / CS₂ → ArCHO (toluene to benzaldehyde)
What each symbol means
| Symbol | What it stands for |
|---|---|
| CS₂ | Carbon disulfide — inert solvent |
| ArCH₃ | Methyl-substituted aromatic compound (e.g., toluene) |
| CrO₂Cl₂ | Chromyl chloride — selective oxidant |
When to use this
Chromyl chloride selectively oxidizes –CH₃ on aromatic ring to –CHO without over-oxidation to –COOH. The intermediate chromium complex is hydrolyzed to give aldehyde.