article: Sigmatropic reaction
links: Stereochemistry Nitrogen Thermal radiation Oxygen Robert Burns Woodward Hydride Hermann Emil Fischer Carbon Woodward-Hoffmann rules Sulfur Roald Hoffmann Aromatic hydrocarbon Hydrogen Centigrade Electrocyclic reaction Woodward–Hoffmann rules Atomic orbital Chemical reaction Cyclic compound Valence (chemistry) Base (chemistry) Lewis acid Greek language HCl