Acylation reactions can vary widely, but some of the most common include the Friedel-Crafts acylation and the Schotten-Baumann reaction. Friedel-Crafts acylation involves the introduction of an acyl group onto an aromatic ring, typically using a Lewis acid catalyst. The Schotten-Baumann reaction, on the other hand, involves the acylation of an amine under basic conditions to yield amides, often using acid chlorides as acylating agents.