Q2. i) In Table 1 (column 3) determine the number of 1H NMR peaks (ignore splitting) that you would expect for each of the above (hint: the no. of different proton environments) and ii) (column 4) predict the simple splitting pattern for each type of proton. StructuralIsomers ofbutanol1-butanol(Example)2-butanol2-methyl-1-propanoltert-butanolHOHOOHOHStructure(Ctrl) -No. ofexpected ¹HNMR peaks(Total 1mark)5Expected splittingpatterns of ¹H NMRpeaks(i.e. singlet(s),doublet(d), multiplet(m)etc.,)(Total 2 marks)CH3CH2CH2CH2-OH br(s)CH3CH2CH2CH2-OH (t)CH3CH2CH2CH2-OH (m)CH3CH2CH2CH2-OH (m)CH3CH2CH2CH2-OH (t)Note: the CH3CH2CH2CH2-OHhydrogen atom rapidlyexchanges and as aconsequence, ignore coupling tothis atom.

In the given question given that four structural isomers of butanol : 1-butanol , 2-butanol ,…

i) In Table 1 (column 3) determine the number of 1H NMR peaks (ignore splitting) that you would expect for each of the above (hint: the no. of different proton environments) and ii) (column 4) predict the simple splitting pattern for each type of proton.

i) In Table 1 (column 3) determine the number of 1H NMR peaks (ignore splitting) that you would expect for each of the above (hint: the no. of different proton environments) and ii) (column 4) predict the simple splitting pattern for each type of proton.

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter5: Signals And Noise

Section: Chapter Questions

Problem 5.11QAP

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Concept explainers

Analyzing and Predicting Spectroscopic Data

The interaction of electromagnetic radiation with the structure of molecules in the sample and their study is referred spectroscopy. Several spectroscopic methods are used to acquire sample information, and these methods are proved to be accurate, fast, and non-destructive. The information obtained about the content and composition of molecules from these spectroscopic methods is called spectroscopic data.

Question

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Q2. i) In Table 1 (column 3) determine the number of ¹H NMR peaks (ignore splitting) that you would expect for each of the above (hint: the no. of different proton environments) and ii) (column 4) predict the simple splitting pattern for each type of proton.

Structural
Isomers of
butanol
1-butanol
(Example)
2-butanol
2-methyl-1-
propanol
tert-butanol
HO
HO
OH
OH
Structure
(Ctrl) -
No. of
expected ¹H
NMR peaks
(Total 1
mark)
5
Expected splitting
patterns of ¹H NMR
peaks
(i.e. singlet(s),
doublet(d), multiplet(m)
etc.,)
(Total 2 marks)
CH3CH2CH2CH2-OH br(s)
CH3CH2CH2CH2-OH (t)
CH3CH2CH2CH2-OH (m)
CH3CH2CH2CH2-OH (m)
CH3CH2CH2CH2-OH (t)
Note: the CH3CH2CH2CH2-OH
hydrogen atom rapidly
exchanges and as a
consequence, ignore coupling to
this atom.

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