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anhydride and releasing regenerated molecule of DMF. Relative to thionyl chloride, oxalyl chloride is more expensive but also a milder reagent and therefore more selective.
:

Other laboratory methods

Acid chlorides can be used as a chloride source. Thus acetyl chloride can be distilled from a mixture of benzoyl chloride and acetic acid:
:CH3CO2H + C6H5COCl -> CH3COCl + C6H5CO2H

Other methods that do not form HCl include

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