- 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...
-
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...
-
triazolium salts to be effective. The
Stetter reaction is an
example of
umpolung chemistry, as the
inherent polarity of the
aldehyde is
reversed by the...
-
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...
-
produce an acyl
anion equivalent (see
cyanohydrin or aldehyde-dithiane
umpolung chemistry, as well as
benzoin condensation). This
anion attacks S1 of an...
-
Polarity inversion may
refer to:
Polarity inversion (chemistry) (aka
Umpolung), in
organic chemistry Polarity inversion (differential pairs), swapping...
-
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...
-
intermediates may also
intercept nucleophiles in a
process that
involves umpolung at the α carbon. In addition,
because reduction of
monohalo ketones produces...
