Find the integral per proton, number of repeating monomer units (n), and Mn for the following 1H-NMR Spectra:
Homework Answers
Looking at the structure, we can tell that signal b corresponds to 3 protons and signals c and d correspond to 4 protons each. This means that the integration corresponding to each proton has a value of 0.25. Knowing this, we can determine the amount of protons that make up the signal for a:
Each monomer contains four protons, which make up the signal. This means that the number of repeating units is:
There are 186 repeating units (n) in this polymer.
The Mn is composed by the weight of things outside of the repeating unit: 224 g/mol
And the mass of the repeating unit multiplied by 186: 44 * 186 = 8184 g/mol
Making the total Mn: 8408 g/mol.
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Find the integral per proton, number of repeating monomer units
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Provide formula, HDI value, and a complete, chemically correct
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Assign signals in the 1H and 13C spectra to specific atoms,
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Write down problem number. Provide formula, HDI value, and a complete, chemically correct structure for each...
Write down problem number.
Provide formula, HDI value, and a complete, chemically correct
structure for each problem.
Assign signals in the 1H and 13C spectra to specific atoms,
identify structural units and/or functional groups.
Example:
Problem # 3
Formula: C8H8O2
HDI: 5
1H NMR: p-substituted Ar at 7.27-7.97 ppm, benzylic CH3 group at
2.42 ppm, COOH proton at 12.9 ppm
13C NMR: carbonyl C at 167.8 ppm (ester or acid), benzylic CH3
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Write down problem number. Provide formula, HDI value, and a complete, chemically correct structure for each...
Write down problem number.
Provide formula, HDI value, and a complete, chemically correct
structure for each problem.
Assign signals in the 1H and 13C spectra to specific atoms,
identify structural units and/or functional groups.
Example:
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Formula: C8H8O2
HDI: 5
1H NMR: p-substituted Ar at 7.27-7.97 ppm, benzylic CH3 group at
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13C NMR: carbonyl C at 167.8 ppm (ester or acid), benzylic CH3
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Figure 1...
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Provide formula, HDI value, and a complete, chemically correct
structure for each problem.
Assign signals in the 1H and 13C spectra to specific atoms,
identify structural units and/or functional groups.
Example:
Problem # 3
Formula: C8H8O2
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1H NMR: p-substituted Ar at 7.27-7.97 ppm, benzylic CH3 group at
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13C NMR: carbonyl C at 167.8 ppm (ester or acid), benzylic CH3
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Identify the relevant peaks in the FTIR spectrum and
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Identify all of the peaks in the NMR spectrum and record
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Hi i need to known unknown molecule, functional group, 1hnmr , 13cnmr information and please give...
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i need to known unknown molecule, functional group, 1hnmr ,
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Write down problem number.
Provide formula, HDI value, and a complete, chemically correct
structure for each problem.
Assign signals in the 1H and 13C spectra to specific atoms,
identify structural units and/or functional groups.
Example:
Problem # 3
Formula: C8H8O2
HDI: 5
1H NMR: p-substituted Ar at 7.27-7.97 ppm, benzylic CH3 group at
2.42 ppm, COOH proton at 12.9 ppm
13C NMR: carbonyl C at 167.8 ppm (ester or acid), benzylic CH3
at 21.40 ppm, 4 remaining signals are Ar...
Write down problem number.
Provide formula, HDI value, and a complete, chemically correct
structure for each problem.
Assign signals in the 1H and 13C spectra to specific atoms,
identify structural units and/or functional groups.
Example:
Problem # 3
Formula: C8H8O2
HDI: 5
1H NMR: p-substituted Ar at 7.27-7.97 ppm, benzylic CH3 group at
2.42 ppm, COOH proton at 12.9 ppm
13C NMR: carbonyl C at 167.8 ppm (ester or acid), benzylic CH3
at 21.40 ppm, 4 remaining signals are Ar...
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Provide formula, HDI value, and a complete, chemically correct
structure for each problem.
Assign signals in the 1H and 13C spectra to specific atoms,
identify structural units and/or functional groups.
Example:
Problem # 3
Formula: C8H8O2
HDI: 5
1H NMR: p-substituted Ar at 7.27-7.97 ppm, benzylic CH3 group at
2.42 ppm, COOH proton at 12.9 ppm
13C NMR: carbonyl C at 167.8 ppm (ester or acid), benzylic CH3
at 21.40 ppm, 4 remaining signals are Ar...
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Evaluate and investigate the
following IR 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
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identify what product can be obtained after the synthesis
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Provide formula, HDI value, and a complete, chemically correct
structure for each problem.
Assign signals in the 1H and 13C spectra to specific atoms,
identify structural units and/or functional groups.
Example:
Problem # 3
Formula: C8H8O2
HDI: 5
1H NMR: p-substituted Ar at 7.27-7.97 ppm, benzylic CH3 group at
2.42 ppm, COOH proton at 12.9 ppm
13C NMR: carbonyl C at 167.8 ppm (ester or acid), benzylic CH3
at 21.40 ppm, 4 remaining signals are Ar...
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13cnmr information and please give me information about ir spectra
using NMR data given.
Carhonyl carbons Aldehydes/Ketones Carboxylic acid derivatives (Acids, amides, esters) Pi-system carbons Aromatics Alkynes Alkenes Carbons with electronegative atoms or groups Ethers/Alcohols (X=0) lodides (X = 1) Other Groups (CI, Br, N. C=C, CHO) Alkyl carbons Methine Methylene Methyl 225 200 175 150 125 100 Chemical Shift (ppm) 75 25 Protons adjacent to electron withdrawing groups...
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