August W. Hofmann
(1818-1892) 

(Gießen, 1841)
Benzidine rearrangement (1863) 

Johann K. W. F. Tiemann
(1848-1899) 

(Berlin, 1870)
First proposal of nitrenes as intermediates in Lossen rearrangement (1891) 

(Halle 1890)
First liquid crystals 

(Halle 1903)
Chemistry Nobel Prize (1953) "Macromolecular Chemistry"
Ketenes (1905)
o-quinonemethide (1911)
Nitrenes (1917)
Pyrethrins 

Leopold Ruzička
(1887–1976) 

(TH Karlsruhe, 1910)
Chemistry Nobel Prize (1939) "Multimembered Rings, Higher Terpene Compounds and Male Sex Hormones"
Total synthesis of fenchone
Wagner rearrangement
Syntheses of ß-collidine and linalool
Structures of jasmone, civetone, and muscone 

George H Büchi
(1921-1998) 

(ETH, Zurich, 1947)
Paterno-Büchi reaction (1954) 

Edward M. Burgess
(1934- ) 

(MIT 1962)
Burgess Reagent (1968) 

Anthony J. Arduengo, III
(1952- ) 

(Georgia Inst. of Tech. 1976)
First stable carbonyl ylide (1983)
First stable nitrile ylide (1984)
Tricoordinate hypervalent pnictogens (1984)
Edge Inversion (1986)
Stable 'Arduengo' carbene [imidazol-2-ylidene] (1991)
C-H-C Hydrogen bond (1995)
Stable Thiazole Carbene (1997)

Daniela Tapu (1976-) 

(Alabama 2005)  
First phenanthrene-fused imidazol-2-ylidene (2008)