Chromium reagents alcohols

In the second step the alcohol is transformed to an aldehyde by means of the Swem oxidation. Other reagents to oxidize alcohols to aldehydes are e. g. Dess-Martin-periodinane and chromium reagents like PCC or PDC. 

Many reagents are available to oxidize a simple secondary alcohol to a ketone. Most labs would have chromium trioxide or sodium dichromate available, and the chromic acid oxidation would be simple. Bleach (sodium hypochlorite) might be a cheaper and less polluting alternative to the chromium reagents. DMP and the Swem oxidation would also work. 

Oxidation Adjacent to Oxygen of Alcohols by Chromium Reagents... 

Sarett and coworkers discovered that the complex (1) prepared by the addition of chromium(VI) oxide to pyridine (CAUTION—reverse order of addition may cause the mixture to inflame) is an efficient oxidizing agent for the preparation of ketones from secondary alcohols. The reagent, as prepared by Sarett, is moderately soluble in pyridine, but is only sparingly soluble in standard organic solvents. Thus the normal procedure is to add a solution of the dcohol in pyridine to three equivalents of the complex, also in pyrictoe. This procedure is also useful for the preparation of aromatic and a, -unsaturated aldehydes, but the use of pyridine as solvent prohibits the oxidation of volatile, saturated primary alcohols. ... 

Oxidation Adjacent to Oxygen of Alcohols by Chromium Reagents Table 2 Oxidation of Alcohols with Ci03 py2 (Collins Oxidation)... 

Table 15 Oxidation of Alcohols with Chromium Reagents on Inen Inorganic Supports...

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