Homework Answers
The most intense (tallest) peak in a mass spectrum, due to the ion with the greatest relative abundance is called the base peak. According to this definition, in the given spectra the tallest and the intense peak is at 45 m/e so the base peak from the given spectra is at 45 m/e
The other significant peaks in the spectra are molecular ion, M+, [M+1], and [M+2] peak pattern with specific relative intensities at 90, 91, and 92 respectively. They indicate the presence of specific atoms such as 13C or 37Cl and thus help identify the actual structure of the compound of interest.
The peak at 60 m/e indicates that there could be the presence of methyl groups because of its difference of 15 with base peak and molecular ion peak and mass of methyl group corresponds to that difference.
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5. Identify the base peak in your mass spectrum. 6. Are there other significant isotope patterns...
8. Give several pieces of data you gathered from the IR spectrum that aided in determining...
8. Give several pieces of data you gathered from the IR spectrum that aided in determining (or confirming) the structure of your unknown. For example, you might mention the presence (or absence) of certain definitive peaks (include wavenumbers). Do NOT use anything from the fingerprint region. 9. Fill in the table below with the information on each unique 1H-NMR signal. You may treat all aromatic protons as a single signal if that helps. Peak Chemical Shift (8) # of *10...
1. Show all your work calculating the # of Cs based on the Mand (M+1]' peaks....
1. Show all your work calculating the # of Cs based on the Mand (M+1]' peaks. 2. Based on the mass spectrum, do you think your compound has a nitrogen atom? Explain. 3. Propose at least two molecular formulas based on the mass spectrum and calculate the exact mass of the parention. Is one of your formula more likely than the other? If so, explain. Compound 14 is a liquid (b.p. 85") which finds its greatest application as an aprotic...
find the molecular structure of the unknown Compound 18 is a basic liquid (b.p. 135') which has two functional grou...
find the molecular structure of the unknown
Compound 18 is a basic liquid (b.p. 135') which has two functional groups. Only the neutral group reacts with acetic anhydride, UV-transparent; IP-liquid film. 3 signals, diff. types of H Mass Spectrum MASS SPECTRAL DATA Unknown mle - (MM) 89 90 Belative Intensity 7.42 0.37 0.02 Intensity m/e m/e Spectrum E NMR Spectre Appro. vicinal 7 Jeminal 2 H2 MR
Intensity MASS SPECTRAL DATA Unknown m/e Relative Intensity Mass Spectrum (мм) 90 18.4 0.83 92 0.09 29 90 I5 60 m/...
Intensity MASS SPECTRAL DATA Unknown m/e Relative Intensity Mass Spectrum (мм) 90 18.4 0.83 92 0.09 29 90 I5 60 m/e 2. Based on the mass spectrum, do you think your compound has a nitrogen atom? Explain. Propose at least two molecular formulas based on the mass spectrum and calculate the exact mass of the parent ion. Is one of your formula more likely than the other? If so, explain. 3.
6. Provide at least one fragment (not the parent ion) that was useful in determining (or confirming) the structure...
6. Provide at least one fragment (not the parent ion) that was useful in determining (or confirming) the structure of the unknown and briefly explain how it was useful. 7. Give several pieces of data you gathered from the IR spectrum that aided in determining (or confirming) the structure of your unknown. For example, you might mention the presence (or absence) of certain definitive peaks (include wavenumbers). Do NOT use anything from the fingerprint region. Chapter 5: INTEGRATED SPECTROSCOPY PROBLEMS...
Please finish answering #3, 5 & 6 1. Show all your work for converting the elemental...
Please finish answering #3, 5 & 6
1. Show all your work for converting the elemental analysis data to a molecular formula, 53.31, 4.4315+2.214 ).71122 12 o107 11.13 11.019& 2.214 = 4.117- /2 1.00714 2.21142.2114( 2 )5, १११4 Cro back 2. Show all your work for calculating the degrees of unsaturation for your unknown. 1o 2N 2 4 2.4+2 3. What it the m/z value of the expected parent ion? Calculate the expected intensity of the [M+1] ion relative to...
10. Briefly explain how the 13C-NMR data was used to determine (or confirm your proposed structure....
10. Briefly explain how the 13C-NMR data was used to determine (or confirm your proposed structure. 11. In both of the boxes below, draw the bond-line structure with appropriate bond angles) of your unknown. On the structure on the left, indicate with a label (peak #from table above) and arrow the source of each signal. On the structure of the right, indicate with a label (13C-NMR ppm) and arrow the source of each signal. Chapter 5: INTEGRATED SPECTROSCOPY PROBLEMS 139...
8. Fill in the table below with the information on each unique 1H-NMR signal. You may treat all aromatic protons a...
8. Fill in the table below with the information on each unique 1H-NMR signal. You may treat all aromatic protons as a single signal if that helps. Peak # Chemical Shift (8) # of H Multiplicity Proposed Fragment Structure 9. Based on your molecular formula, 'H-NMR integration and 13C-NMR, is there any symmetry in your molecule? Explain. Chapter 5: INTEGRATED SPECTROSCOPY PROBLEMS 139 ompound 81 is a liquid (boiling point 85' C) that is commonly used as an aprotic solvent....
Unknown Number: Molecular Formula: Index of Hydrogen Deficiency: Structure: Mass Spec Molecular Weight: Important Fragments; what...
Unknown Number:
Molecular Formula:
Index of Hydrogen Deficiency:
Structure:
Mass Spec
Molecular Weight:
Important Fragments; what are they and what do they mean? (base
peak structure, is there a halogen, is there a benzene ring, is
there an odd number of nitrogens, other important fragments that
tell something about the structure)
IR
Is there an OH? Wavenumber?
Is there a carbonyl group? If so what type (acid. ester, amide,
aldehyde, ketone etc.)? Wave number?
Other important peaks (terminal alkyne, cyano...
Evaluate and investigate the following IR Spectrum, 13C NMR Spectrum and 1H NMR Spectrum. Identify the most important peaks and correlate the results as much as you can from the obtained product in th...
Evaluate and investigate the
following IR Spectrum, 13C NMR Spectrum
and 1H NMR Spectrum. Identify
the most important peaks and correlate the
results as much as you can from the obtained product in
the multi-step synthesis of ethyl acetoacetate.
This is Product E from this multi-step synthesis
where Product C was identified as in the figure
below and as such, identify what product can be obtained
after the synthesis from the spectra provided. Use the template
below in analysing the...
8. Give several pieces of data you gathered from the IR spectrum that aided in determining (or confirming) the structure of your unknown. For example, you might mention the presence (or absence) of certain definitive peaks (include wavenumbers). Do NOT use anything from the fingerprint region. 9. Fill in the table below with the information on each unique 1H-NMR signal. You may treat all aromatic protons as a single signal if that helps. Peak Chemical Shift (8) # of *10...
1. Show all your work calculating the # of Cs based on the Mand (M+1]' peaks. 2. Based on the mass spectrum, do you think your compound has a nitrogen atom? Explain. 3. Propose at least two molecular formulas based on the mass spectrum and calculate the exact mass of the parention. Is one of your formula more likely than the other? If so, explain. Compound 14 is a liquid (b.p. 85") which finds its greatest application as an aprotic...
find the molecular structure of the unknown
Compound 18 is a basic liquid (b.p. 135') which has two functional groups. Only the neutral group reacts with acetic anhydride, UV-transparent; IP-liquid film. 3 signals, diff. types of H Mass Spectrum MASS SPECTRAL DATA Unknown mle - (MM) 89 90 Belative Intensity 7.42 0.37 0.02 Intensity m/e m/e Spectrum E NMR Spectre Appro. vicinal 7 Jeminal 2 H2 MR
Intensity MASS SPECTRAL DATA Unknown m/e Relative Intensity Mass Spectrum (мм) 90 18.4 0.83 92 0.09 29 90 I5 60 m/e 2. Based on the mass spectrum, do you think your compound has a nitrogen atom? Explain. Propose at least two molecular formulas based on the mass spectrum and calculate the exact mass of the parent ion. Is one of your formula more likely than the other? If so, explain. 3.
6. Provide at least one fragment (not the parent ion) that was useful in determining (or confirming) the structure of the unknown and briefly explain how it was useful. 7. Give several pieces of data you gathered from the IR spectrum that aided in determining (or confirming) the structure of your unknown. For example, you might mention the presence (or absence) of certain definitive peaks (include wavenumbers). Do NOT use anything from the fingerprint region. Chapter 5: INTEGRATED SPECTROSCOPY PROBLEMS...
Please finish answering #3, 5 & 6
1. Show all your work for converting the elemental analysis data to a molecular formula, 53.31, 4.4315+2.214 ).71122 12 o107 11.13 11.019& 2.214 = 4.117- /2 1.00714 2.21142.2114( 2 )5, १११4 Cro back 2. Show all your work for calculating the degrees of unsaturation for your unknown. 1o 2N 2 4 2.4+2 3. What it the m/z value of the expected parent ion? Calculate the expected intensity of the [M+1] ion relative to...
10. Briefly explain how the 13C-NMR data was used to determine (or confirm your proposed structure. 11. In both of the boxes below, draw the bond-line structure with appropriate bond angles) of your unknown. On the structure on the left, indicate with a label (peak #from table above) and arrow the source of each signal. On the structure of the right, indicate with a label (13C-NMR ppm) and arrow the source of each signal. Chapter 5: INTEGRATED SPECTROSCOPY PROBLEMS 139...
8. Fill in the table below with the information on each unique 1H-NMR signal. You may treat all aromatic protons as a single signal if that helps. Peak # Chemical Shift (8) # of H Multiplicity Proposed Fragment Structure 9. Based on your molecular formula, 'H-NMR integration and 13C-NMR, is there any symmetry in your molecule? Explain. Chapter 5: INTEGRATED SPECTROSCOPY PROBLEMS 139 ompound 81 is a liquid (boiling point 85' C) that is commonly used as an aprotic solvent....
Unknown Number:
Molecular Formula:
Index of Hydrogen Deficiency:
Structure:
Mass Spec
Molecular Weight:
Important Fragments; what are they and what do they mean? (base
peak structure, is there a halogen, is there a benzene ring, is
there an odd number of nitrogens, other important fragments that
tell something about the structure)
IR
Is there an OH? Wavenumber?
Is there a carbonyl group? If so what type (acid. ester, amide,
aldehyde, ketone etc.)? Wave number?
Other important peaks (terminal alkyne, cyano...
Evaluate and investigate the
following IR Spectrum, 13C NMR Spectrum
and 1H NMR Spectrum. Identify
the most important peaks and correlate the
results as much as you can from the obtained product in
the multi-step synthesis of ethyl acetoacetate.
This is Product E from this multi-step synthesis
where Product C was identified as in the figure
below and as such, identify what product can be obtained
after the synthesis from the spectra provided. Use the template
below in analysing the...
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