1/1/2023 0 Comments Woodward fieser rules pdf![]() ![]() ![]() Here Ring A has one exocyclic and endocyclic double bond. The contribution made by various alkyl substituents or ring residue, double bond extending conjugation and polar groups such as –Cl, -Br etc are added to the basic value to obtain λ max for a particular compound.Ī) Homoannular Diene:- Cyclic diene having conjugated double bonds in same ring.ī) Heteroannular Diene:- Cyclic diene having conjugated double bonds in different rings.Ĭ) Endocyclic double bond:- Double bond present in a ring.ĭ) Exocyclic double bond: - Double bond in which one of the doubly bonded atoms is a part of a ring system. Robert Burns Woodward Louis Frederick FieserĮach 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. It is used to calculate the position and λ max for a given structure by relating the position and degree of substitution of chromophore. In 1959 Louis Frederick Fieser modified these rules with more experimental data, and the modified rule is known as Woodward-Fieser Rules. In 1945 Robert Burns Woodward gave certain rules for correlating λ max with molecular structure. To calculate the maximum wave length of organic compounds.To familiarize the Woodward-Fieser Rules. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |