(a) What are the major advantages and disadvantages of two-dimensional NMRmethods over
Chapter 19, Problem 19-42(choose chapter or problem)
(a) What are the major advantages and disadvantages of two-dimensional NMRmethods over conventional one-dimensional techniques~(b) Describe in detail the pulse sequences that are used in the COSY andHETCOR experiments. For both, describe the behavior of the magnetizationvector M as a result of the applied pulses. Consult note 19 forassistance in learning more about the details of two-dimensional NMRmethods.(c) From the 300-MHz IH NMR spectrum of phenanthro[3,4-b]thiophe.nereproduced in Figure 19-46, identify the resonances of HI and Hll.as a pair.Can you assign any of the other resonances? (d) From the 300-MHz COSY spectrum in Figure 19-47, describe how youwould distinguish the resonances of HI and Hll(e) [n the COSY spectrum of Figure 19-47, assign resonances to Hz, Hs, H" andHIO Give the rationale for your assignments.
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