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Reduced chromium residues can be removed from glassware with concentrated HCl or 10-15% aqueous HF. Solid chromium waste should never be thrown away, as residual CrO<sub>3</sub> may ignite. Chromium(VI) reagents are toxic and should be handled with care in a well-ventilated fume hood.
===Example Procedure<ref>Guziec, F. S., Jr.; Luzzio, F. A. ''J. Org. Chem.'', '''1982''', ''47'', 1787.</ref>===
To a suspension of 4-(dimethylamino)pyridinium chlorochromate (1.24 g, 4.8 mmol) in dry dichloromethane (7.0 mL) was added p-(3-hydroxypropyl)-benzyl alcohol (200 mg, 1.2 mmol). Stirring was continued (2 hours) at room temperature under a nitrogen atmosphere. The reaction mixture was diluted with ethyl acetate (10 mL) and the brown granular chromium reduction products were removed by vacuum filtration through a Celite® pad. Concentration of the solvent and column chromatography on silica gel (hexane/ethyl acetate, 2:1) furnished 121 mg (62%) of p-(3-hydroxypropyl)benzaldehyde as an oil. The spectral data were the same as those of the product reported above with imidazolium dichromate.
<center>[[File:ChroEx.png]]</center>
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