WOODWARD FIESER RULE PDF

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Submit Search. Successfully reported this slideshow. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime. Woodward Fieser Rules for UV spectrometry. Upcoming SlideShare. Like this document? Why not share! Chapter 7 genome structure, chrom Embed Size px. Start on. Show related SlideShares at end. WordPress Shortcode.

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Show More. No Downloads. Views Total views. Actions Shares. Embeds 0 No embeds. No notes for slide. Woodward Fieser Rules for UV spectrometry 1. Introduction 2. In Louis Frederick Fieser modified these rules with more experimental data, and the modified rule is known as Woodward-Fieser Rules.

It is used to calculate the position for a given structure by relating the position and degree of substitution of Each type of diene or triene system is having a certain fixed value at which absorption takes.

The contribution made by various ng conjugation and polar groups such for a particular compound. Woodward-Fieser rule for Conjugated dienes and polyenes. For - unsaturated Carbonyl compounds. For Aromatic compounds or Benzoyl derivatives. Homoannular Diene:- Cyclic diene having conjugated double bonds in same ring. Heteroannular Diene:- Cyclic diene having conjugated double bonds in different rings.

Endocyclic double bond:- Double bond present in a ring. Exocyclic double bond: - Double bond in which one of the doubly bonded atoms is a part of a ring system.

Ring B has only one endocyclic double bond. Double bond extending :- When more double bonds are present other than conjugations. Example 3 1,2,4b,tetramethyl-1,2,3,4,4b,5,6,7-octahydrophenanthrene 9. Example 1 1- 5,6,7,8-tetrahydronaphthalenyl ethanone You just clipped your first slide!

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ESCALA DE TERMAN MERRIL PDF

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Inputs used in the calculation are the type of chromophores present, the auxochromes substituents on the chromophores, and solvent. One set of Woodward—Fieser rules for dienes is outlined in table 1. A diene is either homoannular with both double bonds contained in one ring or heteroannular with two double bonds distributed between two rings. With the aid of these rules the UV absorption maximum can be predicted, for example in these two compounds: [8]. In the compound on the right, the diene is homoannular with 4 alkyl substituents. Both double bonds in the central B ring are exocyclic with respect to rings A and C.

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Woodward's rules

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