Organic Chemistry

578 CHAPTER 14 NMR Spectroscopy

51. Compound A, with molecular formula shows two signals in its NMR spectrum. Compound B, an isomer of compound
    A, shows four signals, and in the proton-coupled mode, the signal farthest downfield is a doublet. Identify compounds A and B.


52. The NMR spectra of three isomers with molecular formula are shown here. Which isomer produces which spectrum?

87654 3210

87654 3210

b.

a.

c.

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δ (ppm)

frequency

δ (ppm)

frequency

δ (ppm)

frequency

1 H C 7 H 14 O

C 4 H 9 Cl, 13 C