This document discusses properties, synthesis, and reactions of pyrimidine. It was authored by Dr. Gurumeet C Wadhawa of the Department of Chemistry at Karmaveer Bhaurao Patil College in Vashi, Navi Mumbai, India. The document covers pyrimidine's aromatic properties, methods of synthesis from 1,3-dicarbonyl compounds and α,β-unsaturated ketones, and examples of electrophilic addition, electrophilic aromatic substitution, and nucleophilic substitution reactions. Medicinal uses of pyrimidine are also mentioned.