Ch16_clicker - What is the frequency of a proton in a NMR...

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12/2/13 1 What is the frequency of a proton in a NMR experiment if B=12T? a. 5.2 Hz b. 520 Hz c. 520 MHz d. 520 GHz " = # B 2 $ = (2.76 % 10 8 T & 1 s & 1 )(12 T ) 2 (3.1415) = 5.2 % 10 8 s & 1 = 520 MHz " = # B 2 $ The presence of 2 nearby spins will split a line into a. 2 lines b. 3 c. 4 d. 5
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12/2/13 2 The presence of 3 nearby spins will split a line into a. 2 lines b. 3 c. 4 d. 5 This is the spectrum of a. Leucine b. Serine c. Threonine d. Histidine
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12/2/13 3 Threonine Assignment Splitting Position (ppm) C ! H C " H doublet 3.6 C " H C # H3 and C ! multiplet 4.3 C # H 3 C " H doublet 1.3 This is the spectrum of a. Isoleucine b. Serine c. Methonine d. Histidine
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12/2/13 4 Modified amino acid residues: Draw 2D NMR spectrum
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12/2/13 5 Modified amino acid residue: Draw structure Suppose that the amino acid residue threonine (structure shown in figure) has been modified and produces the NMR spectrum shown below. Assume that the modification only alters the number and arrangements of carbon atoms. The structure has been changed to have a. One new methyl b. Two new methyls c. A methyl replacing the alpha proton d. A methyl replacing the beta proton
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  • Spring '14
  • single broad peak00, single narrow peak00

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