Adolf Karl Ludwig Claus

He received his PhD in 1862, and in the same year changed his position and started working at the University of Freiburg.

With the retirement of Lambert Heinrich von Babo, Claus succeeded him as full professor.

To preserve valence 4 for carbons, the opposite corners of the hexagon are connected by single bonds.

[2][3] It took years of research before the three postulated structures of benzene – by Albert Ladenburg (1869), August Kekulé 1865 and by Claus – found their place in organic chemistry.

While the prismane was synthesized in 1973,[4] calculations showed that the synthesis of Claus' benzene is impossible.