Etard's reaction is a mild oxidation method used to convert toluene to benzaldehyde.
Step 1: In Etard's reaction, toluene is selectively oxidized to benzaldehyde using chromyl chloride (\( CrO_2Cl_2 \)).
Step 2: The reaction proceeds as: \[ C_6H_5CH_3 + CrO_2Cl_2 \rightarrow C_6H_5CHO \]
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