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Metal-free oxidation of benzyl alcohol to benzaldehyde (1kg scale)

William Dampier

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Synthesis:
1. A mixture of the benzyl alcohol (1000 g) and conc. H2SO4 (930 g) in DMSO (3000 ml) was stirred 2 hours under reflux conditions.
2. The mixture was then cooled to r.t., and brine (4000 ml) was added.
3. The organic phase was extracted with CH2Cl2 (3000 ml), and the organic layer was dried (Na2SO4), filtered, and concentrated under reduced pressure.
4. Benzaldehyde was obtained in good purity, which does not require additional purification.
 
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