Kathleen Lonsdale got in on the ground floor of X-ray crystallography soon after its discovery in the early 20th century, and used it to prove conclusively that the benzene molecule is a flat ...

Phenanthrene is a planar polycyclic aromatic hydrocarbon, consisting of three fused benzene rings. If we add bulky substituents ... serve as useful building blocks for the synthesis of better organic ...

The mid-nineteenth century saw the development of a radical new direction in chemistry ... 1850s, benzene's stability could not be adequately explained until Kekulé conceived the ring structure ...

Aromatic compounds—substances with flat, ring-shaped structures made up of carbon atoms—play an important role in organic chemistry ... well-known example is benzene (C 6 H 6).