Reactive carbonyl species

特許 係属中 Oxygen is more electronegative than carbon, and thus draws electron density away from carbon to increase the bond's polarity. Therefore, the carbon becomes electrophilic (slightly positive). It can be attacked by nucleophiles (negatively charged ions, like the cyanide ion) or a negatively charged part of another molecule, like the pair "lone pair" of nitrogen atom in the ammonia molecule.