(NMR )Is it possible to have a 270° and 360° RF - pulse? What would be...
(NMR )Is it possible to have a 270° and 360° RF - pulse? What would be the effect of it?
Homework Answers
Yes it is possible to have 270° and 360° RF - pulse
270° & 360° method not quite sensitive to radiation damping or relaxation
Chemical shifts
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(NMR )Is it possible to have a 270° and 360° RF - pulse? What
would be...
CHOICES: Resonance Form: RF A, RF B, RF C, or, RF A and B The H NMR spectra of amides (1) have some interesting quirks...
CHOICES: Resonance Form: RF A, RF B, RF C, or, RF A and
B
The H NMR spectra of amides (1) have some interesting quirks. One quirk is that the N-H protons of primary and secondary amides (e.g. 2) are quite broad and appear at relatively high but variable chemical shifts (5-9 ppm). Another "quirk" is that identical N-R groups (e.g R2 groups in 3) can appear at different chemical shifts even though the same groups in a ketone analog...
7. Calculate the 270° pulse width for a radio frequency field strength of 200 kHz. 8....
7. Calculate the 270° pulse width for a radio frequency field strength of 200 kHz. 8. What would be an approximate radio frequency excitation band width for a 90° pulse width of 1.25 microsecond?
In chromotagraphy separation of photosynthetic pigments, is it possible for have an Rf value greater than...
In chromotagraphy separation of photosynthetic pigments, is it possible for have an Rf value greater than 1? = Rf value Distance moved by pigment / Distance moved by solvent yes no
|which ketone has this NMR? The Rf value is .32. This al the data I have....
|which ketone has this NMR? The Rf value is .32. This al the data I have. Gamma Gamme A Kone Gamma DNP Hydracone Derivative Adehyde/Ketone candidates Bp of Starting Carbonyl 48 56 63 2 75 80 2 Unknown propanal acetone -methylpropanal butanal -butanone 3-methylbutanal | I 2-methylbutanai mp of 2,4-DNP Derivative 148 126 187(183) 123 117 123 120 143 156 95 146 104(107) 75 108 162 2 3 | 1 15 131 131 145 153 156 2-pentanone -pentanone 4-methyl-2-pentanone cyclopentanone...
Which of the following compounds would you expect to have the lowest Rf value on a...
Which of the following compounds would you expect to have the lowest Rf value on a silica gel TLC plate developed with dichloromethane? O A. Naphthalene O B. Phenyl acetate OC Butyric acid QUESTION 3 Which of the following compounds would you expect to have the highest Rf value on a silica gel TLC plate developed with dichloromethane? O A 2-octanone O B. Acetic acid C. 1-butanol OD. decane E. acetaldehyde
Concept check T/F You would expect the brachial artery to have a higher pulse rate...
Concept check T/F You would expect the brachial artery to have a higher pulse rate than the dorsalis pedis artery. T/F You would expect the carotid artery to be stronger than the dorsalis pedis artery. T/F Emotions, such as anger cause an increase in pulse rate. T/F You would expect the pulse rate to increase in a test subject after five minutes of moderate exercise. T/F You would expect pulse rate to remain the same...
cations that form weakly charged complexes in HCL would have a high rf value?
cations that form weakly charged complexes in HCL would have a high rf value?
H NMR I have already posted this yesterday but I would like a second expert to...
H NMR
I have already posted this yesterday but I would like
a second expert to identify the peaks. I am having trouble
identifying them.
Std proton F11毛 Pulse Sequence: s2pul Solvent: CDC13 Temp. 25.0 C 298.1 K Operator: File: VNMRS-300 Relax. delay 1.000 sec Pulse 45.0 degrees Acq. time 2.049 sec Width 4807.7 Hz 8 repetitions OBSERVE H1, 299.9383830 MHz DATA PROCESSING Resol, enhancement -0.0 Hz FT size 65536 Total time 0 min, 31 sec 729.09 123.84 105.62 100.00...
Which compound would have the higher Rf value- Cholesterol or Cholesterol Stearate? Explain why (TLC analysis,...
Which compound would have the higher Rf value- Cholesterol or Cholesterol Stearate? Explain why (TLC analysis, Polarity, etc).
ochem* proton NMR What would you look for in the NMR spectrum of benzoic acid that...
ochem* proton NMR What would you look for in the NMR spectrum of benzoic acid that would confirm its presence?
CHOICES: Resonance Form: RF A, RF B, RF C, or, RF A and
B
The H NMR spectra of amides (1) have some interesting quirks. One quirk is that the N-H protons of primary and secondary amides (e.g. 2) are quite broad and appear at relatively high but variable chemical shifts (5-9 ppm). Another "quirk" is that identical N-R groups (e.g R2 groups in 3) can appear at different chemical shifts even though the same groups in a ketone analog...
In chromotagraphy separation of photosynthetic pigments, is it possible for have an Rf value greater than 1? = Rf value Distance moved by pigment / Distance moved by solvent yes no
|which ketone has this NMR? The Rf value is .32. This al the data I have. Gamma Gamme A Kone Gamma DNP Hydracone Derivative Adehyde/Ketone candidates Bp of Starting Carbonyl 48 56 63 2 75 80 2 Unknown propanal acetone -methylpropanal butanal -butanone 3-methylbutanal | I 2-methylbutanai mp of 2,4-DNP Derivative 148 126 187(183) 123 117 123 120 143 156 95 146 104(107) 75 108 162 2 3 | 1 15 131 131 145 153 156 2-pentanone -pentanone 4-methyl-2-pentanone cyclopentanone...
Which of the following compounds would you expect to have the lowest Rf value on a silica gel TLC plate developed with dichloromethane? O A. Naphthalene O B. Phenyl acetate OC Butyric acid QUESTION 3 Which of the following compounds would you expect to have the highest Rf value on a silica gel TLC plate developed with dichloromethane? O A 2-octanone O B. Acetic acid C. 1-butanol OD. decane E. acetaldehyde
H NMR
I have already posted this yesterday but I would like
a second expert to identify the peaks. I am having trouble
identifying them.
Std proton F11毛 Pulse Sequence: s2pul Solvent: CDC13 Temp. 25.0 C 298.1 K Operator: File: VNMRS-300 Relax. delay 1.000 sec Pulse 45.0 degrees Acq. time 2.049 sec Width 4807.7 Hz 8 repetitions OBSERVE H1, 299.9383830 MHz DATA PROCESSING Resol, enhancement -0.0 Hz FT size 65536 Total time 0 min, 31 sec 729.09 123.84 105.62 100.00...
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