Question

1) Predict and assign in the major peaks in the IR spectrum of a) n-propyl acetate, CH3COOCH2CH2CH3 and b) 2-methyl-1-propyl acetate, CH3COOCH2CH(CH3)2

2) Predict and assign in the major peaks in the 1H NMR spectrum of a) n-propyl acetate, CH3COOCH2CH2CH3 and b) 2-methyl-1-propyl acetate, CH3COOCH2CH(CH3)2

3) Predict the appearance of the 1H NMR spectrum of a) methyl acetate, CH3COOCH3 and b) ethyl propionate, CH3CH2COOCH2CH3

Thank you!

Answer 1

n-propyl acetate Infrared Spectrum 1.2 1.0 0.8 0.6 0.4 0.2 0.0 1500 3000 3500 2500 2000 1000 500 Wavenumbers (cm-1) ransmitance

1-Methoxy-2-propyl acetate Infrared Spectrum 1.05 1.00 0.95 0.90 0.85 0.80 0.75 0.70 3500 3000 2500 2000 1500 1000 Wavenumbers (cm-1) Transmitance

IR spectra Major peaks

n-propyl acetate --1800(1/cm)

2 methyl 1 propyl acetate - 1250 (1/cm)

1H NMR spectra

n-propyl acetate --

e.s -0.0 2.5 2.e 1.5 1.0 PpR 3.5 3.e 4.8

The peak at 2.050 ppm is actually the spectra of n propyl acetate at intensity of 1000and frequency of 183.56Hz

The peak at 4.023 ppm is actually the spectra of n propyl acetate at intensity of 250 and frequency of 360.44Hz

The peak at 1.65 ppm is actually the spectra of n propyl acetate at intensity of 92 and frequency of 144.50Hz

The peak at 0.95 ppm is actually the spectra of n propyl acetate at intensity of 316 and frequency of 84.63Hz

13C NMR spectra

n propyl acetate

200 180 160 140 100 120 80 O 20 40 60

peaks for 13C NMR

1. 171.09 ppm at 448 intensity

2. peak at 66.10 ppm and 930 intensity

3. peak at 22.14 ppm and 1000 intensity

4 peak at 20.91 and intensity of 483

5 peak at 10.41 ppm and its corresponding intensity is at 781

In the above graph its intensity is not clear mentioned ,but the above given intensity is true.

1H NMR Spectra of 2 methyl 1 propyl acetate

10 11 ppm

1H NMR spectra of methyl acetate

10 9 7 6 5 4 3 2 1 0 00

PPM

The peak at 2.050 ppm is actually the spectra of methyl acetate at intensity of 1000 and frequency of 614.99 Hz

The peak at 3.662 ppm is actually the spectra of methyl acetate at intensity of 1000 and frequency of 1098.59 Hz

1H NMR Spectra for ethyl Propionate

9 8 7 6 5 4 3 2 1 O CO 00

ITS Major peaks are 4.132 ppm at intensity of 500 and frequency is 1654.71Hz

Peak 2 is 2.319 ppm at intensity of 31 and frequency of 926.64 Hz

Peak 3 is at 1.259 ppm at intensity of 1000 and frequency of 503.17 Hz

peak 4 is 1.140 ppm at intensity of 999 and frequency of 455.57 Hz