Polarity Inversion (other)
Polarity inversion may refer to: * Polarity inversion (chemistry) (aka ), in organic chemistry * Polarity inversion (differential pairs), swapping of positive and negative wires in differential signal links See also

* Polarity reversion * Auto polarity (other) {{disamb ...
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Polarity Inversion (chemistry)
In organic chemistry, umpolung () or polarity inversion is the chemical modification of a functional group with the aim of the reversal of Chemical polarity, 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 for reversed polarity) and E.J. Corey. Polarity analysis during retrosynthetic analysis tells a chemist when umpolung tactics are required to synthesize a target molecule. Introduction The vast majority of important organic molecules contain heteroatoms, which polarize carbon skeletons by virtue of their electronegativity. Therefore, in standard organic reactions, the majority of new bonds are formed between atoms of opposite polarity. This can be considered to be the "normal" mode of reactivity. One consequence of this natural polarization of molecules is that 1,3- and 1,5- heteroatom substituted carbon skeletons are extremely eas ...
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