state and explain Woodward -Hofmann rules
Answers
Answer:
WOODWARD- FIESER RULES Each type of diene or triene system is having a certain fixed value at which absorption takes place; this constitutes the Base value or Parent value The contribution made by various alkyl substituents or ring residue, double bond extending conjugation and polar groups such as –Cl, -Br etc are ...
Explanation:
Woodward's rules, named after Robert Burns Woodward and also known as Woodward–Fieser rules (for Louis Fieser) are several sets of empirically derived rules which attempt to predict the wavelength of the absorption maximum (λmax) in an ultraviolet–visible spectrum of a given compound. Inputs used in the calculation are the type of chromophores present, the auxochromes (substituents on the chromophores, and solvent. Examples are conjugated carbonyl compounds, conjugated dienes, and polyenes.