Perspective on "Quantentheoretische beitrage zum benzolproblem. I. Die elektronenkonfiguration des benzols und verwandter beziehungen" - Huckel E (1931) Z Phys 70 : 204-286

Guided by an intuitive choice of approximations which shows remarkable chem ical insight into the topic of aromaticity, Huckel mastered the difficult m athematical treatment of a complex molecule like benzene at a very early st age of quantum theory using method 1 (now valence bond theory) and method 2 (now molecular orbital theory). He concluded that method 2 is clearly supe rior to method 1 because the results of this method explain directly the pe culiar behaviour of planar molecules with 6 pi electrons.