In organic chemistry, umpolung (German: [ˈʔʊmˌpoːlʊŋ]) or polarity inversion is the chemical modification of a functional group with the aim of the reversal...

The Corey–Seebach reaction, or Seebach Umpolung is a name reaction of organic chemistry that allows for acylation by converting aldehydes into lithiated...

forget about their language and their origin. As a neologism, it echoes Umpolung, 'polarity inversion', leading to an interpretation akin to "ethnicity...

Polarity inversion may refer to: Polarity inversion (chemistry) (aka Umpolung), in organic chemistry Polarity inversion (differential pairs), swapping...

Aldol addition Acyloin condensation Cannizzaro reaction Stetter reaction Umpolung Menon, Rajeev S.; Biju, Akkattu T.; Nair, Vijay (2016). "Recent advances...

produce an acyl anion equivalent (see cyanohydrin or aldehyde-dithiane umpolung chemistry, as well as benzoin condensation). This anion attacks S1 of an...

inversion of polarity between R'(H)Cδ+=Oδ− and R'CLi(SR)2 is referred to as umpolung. The reaction is commonly performed using the 1,3-dithiane. The lithiated...

chemistry since the 1980s. They are related to enolates, but represent an umpolung of their reactivity. Homoenolates can be formed with a variety of different...

Boluda CJ, Juncá C, Soto E, de la Cruz D, Peña A (13 December 2019). "Umpolung in reactions catalyzed by thiamine pyrophosphate dependent enzymes". Ciencia...

chloride is used to remove dithiane groups attached to a carbonyl in an umpolung reaction. This reaction exploits the high affinity of Hg2+ for anionic...