2-Aminobenzaldehydes from quinolinium salts and alkaline hydrogen peroxide

Abstract

2-Formylanilines are very handy. For building various heterocyclic rings. But making them is not so very dandy. Low yields and multi-step 'mongst other things. N-Alkylquinoliniums cleave with great ease. With hydrogen peroxide/aqueous base. (The mechanism's clear to such as Charles Rees). To give these anilines - good yields, good pace.