i. For your NMR spectrum, describe each resonance (signal) by preparing a data t
ID: 1066496 • Letter: I
Question
i. For your NMR spectrum, describe each resonance (signal) by preparing a data table as shown in the following example Unknown Chemical Shift Integration Splitting Coupling Assignment (o), ppm Pattern Constant, Hz 0.90 ppm 3.1 triplet -CH, next to 7.0 Hz -CH2 2. Assign each resonance to a chemical building block (e.g. -CH3, -CH CH-, -OH) 3. Propose a molecular structure, connecting your building block 4. For your IR spectrum, identify the major peaks present and the functional groups they represent
Explanation / Answer
Interpretation of spectrum
1. NMR
0.9 ppm (doublet, 6H) CH3 next to CH
1.5 ppm (triplet, 4H) for CH2 next to CH2
3.6 ppm (triplet, 2H) for CH2 between CH2 and oxygen
2.4 ppm (singlet, 1H) for OH proton
2. Assigned above are resonances to peaks
3. Possible structure
(CH3)6CH-CH2-CH2-CH2-OH
4. IR
3335 cm-1 for O-H stretch
2957 cm-1 for aliphatic C-H stretch
2929 cm-1 for aliphatic C-H stretch
2871 cm-1 for aliphatic C-H stretch
1465 cm-1 for C-O stretch
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