August Kekulé

August Kekulé was a central figure in the development of organic chemistry, best known for his discovery of the ring structure of benzene. This breakthrough allowed chemists to understand the structure of aromatic compounds, which are fundamental to organic synthesis and materials science. He also proposed the theory of valence, which explains how atoms connect to form complex molecules. His work provided the structural framework that allowed organic chemistry to flourish, enabling the development of everything from plastics to pharmaceuticals, and remains a core concept in modern chemical education.