Nucleophilic addition to carbonyl groups

Overview: The general form of the nucleophilic addition to carbonyl group mechanism is as follows: First step is the attack of the nucleophile on the partially positive carbon to make the tetrahedral intermediate with the full negatively charged oxygen. The oxygen then becomes protonated to yield the alcohol. Variety of nucleophiles: Grignard Reagents Alcohols Amines Alkyl Lithium Reagents Acetylide Ions Example of nucleophilic addition to carbonyl groups: In this case, acetylide anion is acting as the nucleophile