A. One mechanism of fragmentation is loss of a neutral radical by cleavage of a bond...
A. One mechanism of fragmentation is loss of a neutral radical by cleavage of a bond from which one electron has been lost. What is the m/z ratio of the most stable cationic fragment that can be generated from dexchlorpheniramine by this mechanism? Show the structure of the fragment and discuss charge stabilization.
B. The base peak in the dexchlorpheniramine mass spectrum occurs at m/z 203. A peak with relative intensity 33.1 occurs at m/z 205. Interpret this information with reference to the original mass and molecular formula of the parent molecule.
C. The base peak in the dexchlorpeniramine mass spectrum (described in question 5) corresponds to a fragment generated through an intramolecular elimination reaction. Identify the atom that acts as a base in this elimination, and draw both products. Indicate which product appears at m/z 203 as a cation radical.
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A. One mechanism of fragmentation is loss of a neutral radical
by cleavage of a bond...
?? Select the correct term(s) to complete each sentence. The is assigned a relative intensity of...
??
Select the correct term(s) to complete each sentence. The is assigned a relative intensity of 100. base peak molecular ion peak The is the most intense peak in the mass spectrum. molecular ion peak base peak The represents the original molecule that has only lost an electron. molecular ion peak base peak could be/represent a smaller, charged fragment of the original molecule. A radical cation The molecular ion The base peak is/represents a positively charged species. The parent ion...
Select the correct term(s) to complete each sentence. Select the correct term(s) to complete each sentence....
Select the correct term(s) to complete each sentence.
Select the correct term(s) to complete each sentence. The is assigned a relative intensity of 100. base peak molecular ion peak The is the most intense peak in the mass spectrum. molecular ion peak base peak The represents the original molecule that has only lost an electron. base peak molecular ion peak could be/represent a smaller, charged fragment of the original molecule. The molecular ion The base peak A radical cation is/represents...
2. Draw the structure of the cation responsible for the base peak (m/z=58) in the mass...
2. Draw the structure of the cation responsible for the base
peak (m/z=58) in the mass spectrum of 3-aminopentane shown
below:
3. Below is given the mass spectrum of a simple alkane. What is
the chemical formula of the alkane? What is the name of the alkane?
Explain how you determined the exact structure of the alkane from
the observed fragments.
4. Below is a mass spectrum of an ester. Identify the ester.
Consider that the dominant fragmentation pathway involves...
The mass spectrum of isopropyl ether is shown below. Draw the radical cation giving the molecular...
The mass spectrum of isopropyl ether is shown below. Draw the radical cation giving the molecular ion. Be sure to include the nonbonding electrons on the oxygen. Identify the fragment giving rise to the peak at m/z = 87. Be sure to include the nonbonding electrons on the oxygen.
Name: Starting with the mass spectrum of n-heptane What is the molecular ion? What fragment is...
Name: Starting with the mass spectrum of n-heptane What is the molecular ion? What fragment is lost to generate the ion with m/z =71? What cation does the peak at m/z = 43 represent? What group does the spacing between each set of ions represent? Why is the peak at (M-15), corresponding to loss of -CH3 so small? Draw the structure of 2,4-dimethylpentane What is the structure of the ion responsible for m/z = 85? Relative Intensity What is the...
Name: 2.2 Hydrogen The relative isotopic abundance for hydrogen 2H: 1H is about 0.00016: 1, and...
Name: 2.2 Hydrogen The relative isotopic abundance for hydrogen 2H: 1H is about 0.00016: 1, and therefore hydrogen isotopic substitutions are unlikely to play a major role in any observed (M+1) peak. The isotope 2H is called "heavy hydrogen or deuterium, and is given the symbol D. We can often provide support for mechanisms by incorporating isotopes such as 13C or D into compounds using isotopically labelled reagents. Mass spectrometry is a useful tool for analyzing such isotopic incorporation by...
need help figuring the unknown and starting these questions. Identify the important (diagnostic) peaks from the...
need help figuring the unknown and starting these
questions.
Identify the important (diagnostic) peaks from the IR spectrum. corresponds to each peak below. Be sure to also add labels your IR spectrum (write the corresponding bond type next to each peak on the IR spectrum itself) 2. List the cm 1 and the bond that 3. List all possible classes of compounds that your unknown could be (i.e. could the unknown be a ketone, alcohol, ester, carboxylic acid? does the...
Unknown H415 100 50 1000 1S00 2000 3000 BRVENUMBERI 4000 Unknown H415 ЗН 1 H-N 2H,...
Unknown H415 100 50 1000 1S00 2000 3000 BRVENUMBERI 4000 Unknown H415 ЗН 1 H-N 2H, q 1H, d 5H, m 1H, d 0 1 2 3 6 7 8 10 11 ppm HSP-00-049 Unknown H415 q 140 120 100 200 180 160 ppm CDS-00-726 20 -40 60 80 Relative Intensity 09 Unknown H415 100 MS-NJ-0442 80 20 thmpt 25 50 75 100 125 150 175 m/z Date: Name: Section/Group: Instructor: Report Sheet: Laboratory 14 MS,IR, 13C NMR, and 'H...
Unknown C314 t00 D 4000 3000 2000 1500 1000 S00 WAVENUMBERI- 3604 84 2967 77 2925 1546 1257 Б 966 37...
Unknown C314 t00 D 4000 3000 2000 1500 1000 S00 WAVENUMBERI- 3604 84 2967 77 2925 1546 1257 Б 966 37 3352 81 79 1492 1450 81 1161 SB 928 72 3087 3063 64 3040 72 72 2867 1686 1646 64 26 62 13 1160 74 761 15 4 1430 1103 79 731 79 6B 1360 1079 62 691 14 3029 72 3005 68 1599 21 1313 1025 50 82 618 61 1683 41 1303 63 1001 74 688 17...
Unknown C313 L00 J000 500 3000 4000 RVENUNER 678 77 629 77 109e 66 77 2971...
Unknown C313 L00 J000 500 3000 4000 RVENUNER 678 77 629 77 109e 66 77 2971 16 20 1461 1415 38 26 1050 2940 2800 26e1 74 41 S3 492 66 24 1384 1341 66 1285 27 55 1044 37 886 44 2668 44 780 57 72 712 4 1235 32 762 1222 26 467 39 Unknown C313 200 180 160 140 120 100 80 60 40 20 ppm 100 Unknown C313 80- 60 40 20 0 tT 10 30...
??
Select the correct term(s) to complete each sentence. The is assigned a relative intensity of 100. base peak molecular ion peak The is the most intense peak in the mass spectrum. molecular ion peak base peak The represents the original molecule that has only lost an electron. molecular ion peak base peak could be/represent a smaller, charged fragment of the original molecule. A radical cation The molecular ion The base peak is/represents a positively charged species. The parent ion...
Select the correct term(s) to complete each sentence.
Select the correct term(s) to complete each sentence. The is assigned a relative intensity of 100. base peak molecular ion peak The is the most intense peak in the mass spectrum. molecular ion peak base peak The represents the original molecule that has only lost an electron. base peak molecular ion peak could be/represent a smaller, charged fragment of the original molecule. The molecular ion The base peak A radical cation is/represents...
2. Draw the structure of the cation responsible for the base
peak (m/z=58) in the mass spectrum of 3-aminopentane shown
below:
3. Below is given the mass spectrum of a simple alkane. What is
the chemical formula of the alkane? What is the name of the alkane?
Explain how you determined the exact structure of the alkane from
the observed fragments.
4. Below is a mass spectrum of an ester. Identify the ester.
Consider that the dominant fragmentation pathway involves...
The mass spectrum of isopropyl ether is shown below. Draw the radical cation giving the molecular ion. Be sure to include the nonbonding electrons on the oxygen. Identify the fragment giving rise to the peak at m/z = 87. Be sure to include the nonbonding electrons on the oxygen.
Name: Starting with the mass spectrum of n-heptane What is the molecular ion? What fragment is lost to generate the ion with m/z =71? What cation does the peak at m/z = 43 represent? What group does the spacing between each set of ions represent? Why is the peak at (M-15), corresponding to loss of -CH3 so small? Draw the structure of 2,4-dimethylpentane What is the structure of the ion responsible for m/z = 85? Relative Intensity What is the...
Name: 2.2 Hydrogen The relative isotopic abundance for hydrogen 2H: 1H is about 0.00016: 1, and therefore hydrogen isotopic substitutions are unlikely to play a major role in any observed (M+1) peak. The isotope 2H is called "heavy hydrogen or deuterium, and is given the symbol D. We can often provide support for mechanisms by incorporating isotopes such as 13C or D into compounds using isotopically labelled reagents. Mass spectrometry is a useful tool for analyzing such isotopic incorporation by...
need help figuring the unknown and starting these
questions.
Identify the important (diagnostic) peaks from the IR spectrum. corresponds to each peak below. Be sure to also add labels your IR spectrum (write the corresponding bond type next to each peak on the IR spectrum itself) 2. List the cm 1 and the bond that 3. List all possible classes of compounds that your unknown could be (i.e. could the unknown be a ketone, alcohol, ester, carboxylic acid? does the...
Unknown H415 100 50 1000 1S00 2000 3000 BRVENUMBERI 4000 Unknown H415 ЗН 1 H-N 2H, q 1H, d 5H, m 1H, d 0 1 2 3 6 7 8 10 11 ppm HSP-00-049 Unknown H415 q 140 120 100 200 180 160 ppm CDS-00-726 20 -40 60 80 Relative Intensity 09 Unknown H415 100 MS-NJ-0442 80 20 thmpt 25 50 75 100 125 150 175 m/z Date: Name: Section/Group: Instructor: Report Sheet: Laboratory 14 MS,IR, 13C NMR, and 'H...
Unknown C314 t00 D 4000 3000 2000 1500 1000 S00 WAVENUMBERI- 3604 84 2967 77 2925 1546 1257 Б 966 37 3352 81 79 1492 1450 81 1161 SB 928 72 3087 3063 64 3040 72 72 2867 1686 1646 64 26 62 13 1160 74 761 15 4 1430 1103 79 731 79 6B 1360 1079 62 691 14 3029 72 3005 68 1599 21 1313 1025 50 82 618 61 1683 41 1303 63 1001 74 688 17...
Unknown C313 L00 J000 500 3000 4000 RVENUNER 678 77 629 77 109e 66 77 2971 16 20 1461 1415 38 26 1050 2940 2800 26e1 74 41 S3 492 66 24 1384 1341 66 1285 27 55 1044 37 886 44 2668 44 780 57 72 712 4 1235 32 762 1222 26 467 39 Unknown C313 200 180 160 140 120 100 80 60 40 20 ppm 100 Unknown C313 80- 60 40 20 0 tT 10 30...
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