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The Cornforth reagent(CrO3/Pyridine/water), is an oxidizing agent used to convert secondary alcohols to ketones. It is prepared by slow addition of chromic anhydride in water to pyridine in ice cold conditions. A complex of chromium(VI) oxide with aqueous pyridine, with the chemical formula (C5H5NH)2Cr2O7 is formed during this addition. The oxidation of primary alcohols do not stop at aldehyde stage due to presence of water. The reaction continues until a carboxylic acid is obtained finally. However PDC in dichloromethane can be used conveniently to oxidize primary alcohols to aldehydes in anhydrous conditions. References Cornforth, R.H.; Cornforth, J.W.; Popjak, G. (1962). "Preparation of R-and S-mevalonolactones". Tetrahedron 18: 1351–4. doi:10.1016/S0040-4020(01)99289-0.  Further reading G. Tojo and M. Fernâandez (2006). Oxidation of alcohols to aldehydes and ketones : a guide to current common practice. Springer. ISBN 0387236074.  This article about an organic compound is a stub. You can help Wikipedia by expanding it. v • d • e