20th Century
Born: Dresden (Germany), 1857 
Died Dresden (Germany), 1935 
Hantzsch studied at the Technical High School in Dresden and obtained a Ph.D. in Würzburg under Wislecenus in 1880. He became professor organic chemistry at the Technical High School in Zürich (1885-1893), at the University of Würzburg (1893-1903) and the University of Leipzig (1903-1927). He studied stereochemistry. He synthesised pyridine (1882), cumaron (1886) and thiazol (1889) and he gave a nomenclature of heterocyclic compounds. From 1907 he studied cryoscopy and UV-spectroscopy.