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What is the mechanism for the following oxidation of toluene with $\ce{CrO3}$ in acetic anhydride?

Use of chromic oxide ($\ce{CrO3}$): Toluene or substituted toluene is converted to benzylidene diacetate on treating with chromic oxide in acetic anhydride. The benzylidene diacetate can be hydrloyzed to corresponding benzaldehyde with aqueuous acid.

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    $\begingroup$ This appears to be the Étard reaction, which proceeds via a 2,3 Sigmatropic rearrangment. You can read about it here. $\endgroup$ – Tim Biegeleisen Sep 3 '16 at 7:00
  • $\begingroup$ In etard reaction Chromylchloride is used and if it were like etard reaction then methyl of toluene will not get disubsituted. $\endgroup$ – JM97 Sep 3 '16 at 7:04
  • $\begingroup$ I don't see why CrO2Cl2 would behave any differently than chromic oxide. Can you explain why you would expect a different outcome? $\endgroup$ – Tim Biegeleisen Sep 3 '16 at 7:10
  • $\begingroup$ Please see this chemistry.stackexchange.com/questions/58381/… $\endgroup$ – JM97 Sep 3 '16 at 7:11
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    $\begingroup$ wikipedia mechanism is based on papers of 1950-60s .. pubs.acs.org/doi/abs/10.1021/ic200877f this is a recent mechanism proposed $\endgroup$ – vishesh jain Aug 27 at 8:34

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