However, it is possible to stop the oxidation at
the aldehyde stage with suitable reagents that convert the methyl
group to an intermediate that is difficult to oxidise further The
following methods are used for this purpose (a) Use of chromyl chloride (CrO2Cl2): Chromyl chloride oxidises
methyl group to a chromium complex, which on hydrolysis
gives corresponding benzaldehyde Rationalised 2023-24
233
Aldehydes, Ketones and Carboxylic Acids
This reaction is called Etard reaction