Explore BrainMass

# Calculation of percentage yield of nitrone

Not what you're looking for? Search our solutions OR ask your own Custom question.

This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

Materials and Methods

Results
An 1H-NMR spectrum of the compound was run in deuterated chloroform (CDCl3). An ESR spectrum of the compound was run. The 1H-NMR and ESR spectrum peaks are tabulated in table I. The 1H-NMR and ESR spectrum integrated values are tabulated in table II. The melting point was determined to be 72.5 - 75.0oC.
Table I. Peaks of 1H-NMR in chloroform and ESR
1H-NMR (ppm) ESR
8.25, 7.60, 7.40, 7.25, 5.25, 3.90, 3.75, 3.50, 1.60, 1.50, 1.25, 1.00

Table II. Integration values of 1H-NMR in chloroform and ESR.
1H-NMR ESR
1.00, 0.43, 1.46, 0.61, 9.16, 4.53, 5.56, 7.43, 14.56, 4.69

Peak assignments: 1.60 (9H, tBu-H), 7.25 (m, 3H, Ph-H), 7.60 (1H, C-H), 8. 25 (2H, Ph-H). These compare well with the literature values of 1.62, 7.35, 7.55, and 8.29 (Give the Andrade reference here). The other peaks are from solvent and perhaps unreacted reactants - 7.25 (CDCl3), 1.00 (TMS). If you want to assign the other non-product peaks, look at the NMR of the reactants and see if they match up. The melting point from literature is 72oC and use the Andrade reference here as well.

Have #1 and #4 listed below been answered in the information you provided

1. Calculation of percent yield of nitrone 10 _____
2. m. p. of nitrone (compare with literature value; incl. reference) 10 _____

H NMR spectrum* of nitrone
3. quality of spectrum 10 _____
4. assignment of resonances 10 _____
5. comparison with literature spectrum (incl. reference) 5 _____

ESR spectra*
6. quality of spectrum 10 _____
7. interpretation of spectrum
8. determination of hyperfine coupling constant values 10 _____
9. calculation of g value 10 _____
10. comparison of spectral parameters with literature data (incl. reference) 5 _____

Formatting and appearance of report 10 _____

https://brainmass.com/chemistry/inorganic-chemistry/calculation-percentage-yield-nitrone-562150

## SOLUTION This solution is FREE courtesy of BrainMass!

Materials and Methods

Results
An 1H-NMR spectrum of the compound was run in deuterated chloroform (CDCl3). An ESR spectrum of the compound was run. The 1H-NMR and ESR spectrum peaks are tabulated in table I. The 1H-NMR and ESR spectrum integrated values are tabulated in table II. The melting point was determined to be 72.5 - 75.0oC.
Table I. Peaks of 1H-NMR in chloroform and ESR
1H-NMR (ppm) ESR
8.25, 7.60, 7.40, 7.25, 5.25, 3.90, 3.75, 3.50, 1.60, 1.50, 1.25, 1.00

Table II. Integration values of 1H-NMR in chloroform and ESR.
1H-NMR ESR
1.00, 0.43, 1.46, 0.61, 9.16, 4.53, 5.56, 7.43, 14.56, 4.69

Peak assignments (resonances): 1.60 (9H, tBu-H), 7.25 (m, 3H, Ph-H), 7.60 (1H, C-H), 8. 25 (2H, Ph-H). These compare well with the literature values of 1.62, 7.35, 7.55, and 8.29 (Give the Andrade reference here). The other peaks are from solvent and perhaps unreacted reactants - 7.25 (CDCl3), 1.00 (TMS). If you want to assign the other non-product peaks, look at the NMR of the reactants and see if they match up. The melting point from literature is 72oC and use the Andrade reference here as well.

Have #1 and #4 listed below been answered in the information you provided

Percent yield:
Molar mass of nitrone = 177.24 g/mol
Moles of amine = (0.91 mL x 0.899 g/mL ) / 163.26 g/mol = 0.005 mol
Theoretical yield = 0.005 mol x 177.24 g/mol = 0.8862 g
Percent yield = (0.6010 g/ 0.8862 g) x 100 = 67.82%

1. Calculation of percent yield of nitrone 10 _____
2. m. p. of nitrone (compare with literature value; incl. reference) 10 _____

H NMR spectrum* of nitrone
3. quality of spectrum 10 _____
4. assignment of resonances 10 _____
5. comparison with literature spectrum (incl. reference) 5 _____

ESR spectra*
6. quality of spectrum 10 _____
7. interpretation of spectrum
8. determination of hyperfine coupling constant values 10 _____
9. calculation of g value 10 _____
10. comparison of spectral parameters with literature data (incl. reference) 5 _____

Formatting and appearance of report 10 _____

This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!