How many peaks would be observed for each of the circled protons in the compounds below? BrH₂C-C-CH₂Br CH₂Br H₂CH HC-COH CIH₂C-C-C-CH₂CI HH HH 11 1=7; 1 = 1; 1 = 3 1=7; 11 = 3; 1 = 3 1=6; 1 = 2; 1 = 3 1=7; 1 = 2; 1 = 3
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- Into how many peaks will each of the circled protons be split? (Assume complete resolution of all NMR peaks is possible) CI CH3 H H₂C OH H H 1 Br H Multiple Choice 11 1=2; 11= 6; 111=4 1=2, 11=7; 11=4 1=2, 11 = 7, 11=3 1= 3,11 = 7, 111=4 III -CH3 H *** NextConnections to biology 5. Tyrosine is an important amino acid in Biochemistry. Assign the peaks in the ¹H-NMR to the hydrogens in the structure of tyrosine by placing a, b, c, and d in the appropriate corresponding boxes. The hydrogen atoms attached to O and N atoms do not need to be labeled on this spectrum. b 14 12 10 d HN C NH₂ histidine PPM OHHow many peaks would be observed for each of the circled protons in the compounds below? Н "I 0 1-7; 1=4; Il= 3; IV = 4, 0 1-8; 11-4; III-3; IV - 3. О 2 1 - 7; 1 = 3; 111 = 3; IV - 3. O1-7; 11-4; 1-2; IV = 4. CI Н Ш OH H НС IV Н н
- Signal b in the spectrum for 2-ethoxyethyl acetate ( comes from the Hs connected to: O C4 C1 C3 O C2 O C5 PPM G11C2 CA C5Consider the following compounds, determine how many peaks would the circled protons be split into? CI H Br H H₂C CH3 H 11 OH ||| HJO-H Н C-CH3 НIdentify the relationship between the labelled protons as homotopic, enantiotopic or diastereotopic for the molecules below. Ha + Hb = Ha Hb Hc + Hd = سائل Hc. Hd
- Which one of these four compounds would give a 13C NMR spectrum with only these three peaks, one at 210, one at 40 and one at 20? H3C OB OD 13C NMR delta (8) values C=O of ketones, aldehydes C=O of acids, esters, amides C=C and C=N C-X (where X = halogen, O) base position, alkyl C OC A OA CH3 H3C B CH3 H3C1 220-200 160-180 100-150 40-70 0 - 40 CH3 H₂C D CH3Identify the peaks in the C-NMR of C5H8O.How many non-equivalent proton signals are expected in chloroethene (shown)? CI H H H
- When the 1HNMR spectrum of an alcohol is run in dimethylsulfoxide (DMSO) solvent rather than in chloroform, exchange of the Ο-H proton is slow and spin-spin splitting is seen between the Ο-H proton and C-H protons on the adjacent carbon. What spin multiplicities would you expect for the hydroxyl protons in the following alcohols? (a) 2-Methyl-2-propanol (b) Cyclohexanol (c) Ethanol (d) 2-Propanol (e) Cholesterol (f) 1-MethylcyclohexanolA compound has the molecular formula: C4H8O2 and gives the following C-13 NMR spectrum. Provide the most likely functional groups for each signal. nmrsim presentation 1 1 C:Bruken Topspin3.5pl7 examdata -170.7658 150 100 d 170.8 (O CH3) ; 60.4 (OCH2); 20.8, 14.1 (2 x C=0) 8170.8 (0 CH₂); 60.4 (OCH₂); 20.8, 14.1 (2 x CH3). 8 170.8 (CH3); 60.4 (C-0); 20.8, 14.1 (2 x OCH₂) 8170.8 (C=0); 60.4 (OCH₂); 20.8, 14.1 (2 x CH3). 8170.8 (C) ; 60.4 (O CH2); 20.8, 14.1 (2 x O CH3) -60.4293 50 -20.7902 -14.1385 [ppm] [+]Consider the multiplicity of the ¹H NMR peak shown below. Identify how many hydrogens are on the neighboring carbon(s). alle 1 4 7 +/- 2 5 8 Hydrogens 3 6 9 0 X C x 100
