Emanuele Paternò di Sessa
Emanuele Paternò
Born	(1847-12-12)12 December 1847 Palermo, Kingdom of the Two Sicilies
Died	17 January 1935(1935-01-17) (aged 87) Palermo
Nationality	italian
Alma mater	University of Palermo
Known for	Paternò–Büchi reaction
Scientific career
Fields	Chemistry, Politics
Institutions	University of Palermo, University of Torino, University of Rome, University of Marburg
Doctoral advisor	Stanislao Cannizzaro

Emanuele Paternò, 9th Marquess of Sessa was an Italian chemist and politician and is credited with the discovery of the Paternò–Büchi reaction.

He was born in Palermo in 1847 as the Marquess of Sessa, in a branch of the House of Paternò. He studied at the University of Palermo with Stanislao Cannizzaro.

In 1871 he became a lecturer at the University of Torino, but returned to Palermo the following year as Cannizzaro's successor. In 1892 he became a professor at the University of Rome. His main area of research was photochemistry, and discovered the Paternò–Büchi reaction in 1909.^[1] The reaction was improved by George Büchi, its other namesake, in 1954.^[2]

Paternò was politically active. He served as the Mayor of Palermo (1890–1892), and in 1890 he was appointed by King Victor Emmanuel III a member of the Senate of the Kingdom of Italy. He was later elected vice president (1904-1919) of the Italian upper house.