Woodward-Fieser Rules for the Calculation of π * Absorption Maximum forUnsaturated Carbonyl compoundsRαandParent a, ß unsaturated carbonyl compound(acylic, six member or larger ring ketone) R = alkylRfeYα5 member ring ketoneAldehyde (R = H)Acid or Ester (R = OH or OR)Each Alkyl substituenta addB addIf other double bonds, for each d, y, etc. addEach exocylic carbon-carbon double bond addαВdEach extra conjugation add(do not count double bond as substituent, as this effect is included)Each homoannular addEach polar group:-OH-O-Ac at a,ß, or d-ORλ (nm)215202207193101218530393530506 To distinguish between the following pairs of compounds, which methods would yourather use: UV-Vis, IR or MS. Explain your choice and show your calculations, ifapplicable.AB

λmax is wavelength at which maximum absorbance With help of λmax we can distinguish given compoundCompound A and B distinguish by UV and vis Because compound B show higher λmax than compound A

Answered: To distinguish between the following…

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To distinguish between the following pairs of compounds, which methods would you rather use: UV-Vis, IR or MS. Explain your choice and show your calculations, if applicable. A B

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

NMR Spectroscopy

NMR stands for Nuclear Magnetic Resonance in which the study of different molecules is done based on the interaction of radiofrequency electromagnetic radiations with the nuclei of molecules placed in a strong magnetic field. A precise study of spectra of visible light and all bands of electromagnetic radiation is called spectroscopy.

Question

Woodward-Fieser Rules for the Calculation of π * Absorption Maximum for
Unsaturated Carbonyl compounds
R
α
and
Parent a, ß unsaturated carbonyl compound
(acylic, six member or larger ring ketone) R = alkyl
R
fe
Y
α
5 member ring ketone
Aldehyde (R = H)
Acid or Ester (R = OH or OR)
Each Alkyl substituent
a add
B add
If other double bonds, for each d, y, etc. add
Each exocylic carbon-carbon double bond add
α
В
d
Each extra conjugation add
(do not count double bond as substituent, as this effect is included)
Each homoannular add
Each polar group:
-OH
-O-Ac at a,ß, or d
-OR
λ (nm)
215
202
207
193
10
12
18
5
30
39
35
30
50
6

To distinguish between the following pairs of compounds, which methods would you
rather use: UV-Vis, IR or MS. Explain your choice and show your calculations, if
applicable.
A
B

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