Eligio Perucca (28 March 1890 in Potenza – 5 January 1965 in Rome) was an Italian physics instructor and researcher at the University of Turin in Italy in the early decades of the twentieth century. He later served a professorship at the nearby Polytechnic University of Turin. He discovered an important principle in stereochemistry in 1919, but his contribution was overlooked and forgotten until recently.
Giuseppe Oddo (9 June 1865 – 5 November 1954) was an Italian chemist. The Oddo–Harkins rule is named after him and William Draper Harkins. He published his findings in 1914 in a German journal.
Icilio Guareschi (24 December 1847 – 20 June 1918) was an Italian chemist.
Icilio Guareschi studied at the University of Bologna and received his Ph.D there in 1871. He became professor at the University of Siena and in 1879 at the University of Turin, where he worked until his death in 1918.
Guareschi worked in the field of organic chemistry, pharmacy, toxicology and the history and chemistry. In 1894 he discovered a reaction to synthesise 2-Pyridones, today known as the Guareschi-Thorpe condensation.