umpolung

Any process by which the normal alternating donor and acceptor reactivity pattern of a chain, which is due to the presence of O or N heteroatoms, is interchanged. Reactivity umpolung is most often achieved by temporary exchange of heteroatoms (N, O) by others, such as P, S, and Se. The original meaning of the term has been extended to the reversal ...
Found on http://www.chem.qmul.ac.uk/iupac/gtpoc/TtZ.html

Umpolung

Umpolung or polarity inversion in organic chemistry is the chemical modification of a functional group with the aim of the reversal of polarity of that group. This modification allows secondary reactions of this functional group that would otherwise not be possible. The concept was introduced by D. Seebach (hence the German word umpolung for rever...
Found on http://en.wikipedia.org/wiki/Umpolung
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