Woodward's rules
The rules are named after Robert Burns Woodward. He was a Harvard University chemistry professor who won the Nobel Prize in chemistry. The rules are sometimes called the 'Woodward-Fieser rules', to also honor Louis Fieser. The rules build the prediction on the type of chromophores present, the substituents on the chromophores, and changes due to the solvent. Examples are conjugated carbonyl compounds conjugated dienes, and polyenes.