Complete this table for some of the possible impurities that could appear in NMR spectrum experiment. Chemical shifts (ppm) and multiplicities of impurity peaks Identity of impurity 1.56, singlet acetone 3.21, singlet; 1.19 singlet 2.45, quartet; 2.14, singlet; 1.06, triplet Note: tert-butyl methyl ether and butanone are two solvents we will use in this experiment that are not included in the "Common NMR impurities" document. The spectrum of each is shown below. Determine which 'H NMR spectrum is of tert-butyl methyl ether and which is of butanone, then fill in the last two rows in the table above. 11 10 7. pom ppm

Organic Chemistry: A Guided Inquiry
2nd Edition
ISBN:9780618974122
Author:Andrei Straumanis
Publisher:Andrei Straumanis
ChapterL1: Infrared Spectroscopy
Section: Chapter Questions
Problem 16CTQ
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Complete this table for some of the possible impurities that could appear in NMR spectrum
experiment.
Chemical shifts (ppm) and multiplicities
of impurity peaks
Identity of impurity
1.56, singlet
acetone
3.21, singlet; 1.19 singlet
2.45, quartet; 2.14, singlet; 1.06, triplet
Note: tert-butyl methyl ether and butanone are two solvents we will use in this experiment that are
not included in the "Common NMR impurities" document. The spectrum of each is shown below.
Determine which 'H NMR spectrum is of tert-butyl methyl ether and which is of butanone, then fill
in the last two rows in the table above.
11
10
6.
ppm
ppm
Transcribed Image Text:Complete this table for some of the possible impurities that could appear in NMR spectrum experiment. Chemical shifts (ppm) and multiplicities of impurity peaks Identity of impurity 1.56, singlet acetone 3.21, singlet; 1.19 singlet 2.45, quartet; 2.14, singlet; 1.06, triplet Note: tert-butyl methyl ether and butanone are two solvents we will use in this experiment that are not included in the "Common NMR impurities" document. The spectrum of each is shown below. Determine which 'H NMR spectrum is of tert-butyl methyl ether and which is of butanone, then fill in the last two rows in the table above. 11 10 6. ppm ppm
8. In real life, NMR samples often contain impurities, so extra signals will appear on your
spectrum that are not related to your product. The document "Common NMR impurities"
lists some common impurities and their NMR data. Here are some instructions for reading
this document:
o Use Table 1 on page 2 of the document, focusing on the column for CDCI3. (This
is the NMR solvent we are using.)
o The impurities are listed in the first column.
o The "mut" column tells you the multiplicities those signals should have.
• s = singlet, d = doublet, t = triplet, q = quartet, etc.
o The numbers in the table are the chemical shifts that certain impurities appear at.
o For example, if diethyl ether is present in your sample, you should see two signals:
a triplet at 1.21 ppm and a quartet at 3.48 ppm.
Transcribed Image Text:8. In real life, NMR samples often contain impurities, so extra signals will appear on your spectrum that are not related to your product. The document "Common NMR impurities" lists some common impurities and their NMR data. Here are some instructions for reading this document: o Use Table 1 on page 2 of the document, focusing on the column for CDCI3. (This is the NMR solvent we are using.) o The impurities are listed in the first column. o The "mut" column tells you the multiplicities those signals should have. • s = singlet, d = doublet, t = triplet, q = quartet, etc. o The numbers in the table are the chemical shifts that certain impurities appear at. o For example, if diethyl ether is present in your sample, you should see two signals: a triplet at 1.21 ppm and a quartet at 3.48 ppm.
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