Swern-oxidation uses dimethylsulphoxide, 
, oxalyl chloride 
and triethylamine. What is it used for?
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Swern - oxidation is the oxidation of primary and secondary alcohol to aldehydes or ketones using Oxalyl chloride, DMSO and Triethylamine.
This method was widely used , but people try to avoid this method for preparaing aldehydes and ketones using this method as it is not considered eco-freindly as it produces an unpleasant smelling dimethyl sulfide as by product in a large quanitity which is harmful.
The reaction mechanism for swern - oxidation is given in the image attached.
Hope this helps : )
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