Process for preparing aromatic aldehydes

[demorol]

This patent describes production of 3,4-methylenedioxytoluene, piperonal, veratraldehyde and several other interesting compounds from m- and p-cresol.

Patent US4335263

Abstract
A process for preparing an aromatic aldehyde represented by the following general formula:*

wherein R1 and R2 each represents a hydrogen atom a  or lower alkyl group or R1 and R2 may jointly form an alkylene group, provided that R1 and R2 do not represent a hydrogen atom at the same time.

*Unfortunately I had some problems uploading the image, so you'll have to check the patent if you want to know how the formula looks like.
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