1965 Robert Burns Woodward and Roald Hoffmann propose the Woodward–Hoffmann rules, which use the symmetry of molecular orbitals to explain the stereochemistry of chemical reactions.
1965 Robert Burns Woodward dan Roald Hoffmann mengusulkan aturan Woodward–Hoffmann, yang menggunakan simetri orbital molekul untuk menjelaskan stereokimia reaksi kimia.