has specified product has specified reactant ketone aldehyde propane-1,3-dithiol butyllithium functional group modification Corey-Seebach reaction 2021-11-05T07:51:22Z A chemical reaction in which ketones are synthesized from formaldehyde or other aldehydes, involving a temporary repolarization of a carbonyl group. Corey-Seebach Umpolung RXNO RXNO:0000662 Seebach Umpolung