The Swern oxidation is an organic reaction used to convert a primary alcohol to an aldehyde and a secon-dary alcohol to a ketone using DMSO, oxalyl chloride, and triethylamine. The mechanism begins with the activation of DSMO with oxalyl chloride which is then attacked by a chloride anion to form a chlorosulfo-nium cation and release both CO and CO₂ gas. Formula of Methyl 3-fluoroisonicotinate 1627973-06-1 structure The alcohol then attacks the chlorosulfonium salt which releases the chloride anion and forms an alkoxysulfonium cation. Triethylamine then deprotonates the alkoxysulfonium at the alpha position to form a alkoxysulfonium ylide. A rearrangemnt then ensues which releases a molecule of dimethyl sulfide gas and results in the final aldehyde or ketone product. ^[1][2]