Organic Chemistry

8 a. b. 7654 3210 87654 3210 CHCH 2 CH 3 CH 3 OH CHCH 2 CH 3 CH 3 OH e c a b d δ (ppm) frequency δ (ppm) frequency Section 14.17 ...

562 CHAPTER 14 NMR Spectroscopy a b ∆ /J = 20 CH 3 CH 2 X ∆ = 100 Hz Jab = 5.0 Hz ∆ = 25 Hz ∆ /J = 5 ∆ = 15 Hz ∆ /J = 3 ∆ = 10 H ...

Section 14.18 13 CNMR Spectroscopy 563 NMR and NMR spectroscopy are essentially the same. There are, however, some differences t ...

564 CHAPTER 14 NMR Spectroscopy giving rise to the signal. Thus, the number of carbons giving rise to a NMR signal cannot routin ...

Section 14.18 13 CNMR Spectroscopy 565 PROBLEM 36 Answer the following questions for each of the compounds: a. How many signals ...

PROBLEM 37 Describe the proton-coupled NMR spectrum for compounds 1, 3, and 5 in Problem 36, showing relative values (not absolu ...

200 175 150 125 100 75 50 25 0 b.C 8 H 9 Br c.C 6 H 10 O δ (ppm) frequency 200 180 160 140 120 100 80 60 40 20 0 δ (ppm) frequen ...

568 CHAPTER 14 NMR Spectroscopy 14.19 DEPT NMR SPECTRA A technique called DEPT NMR has been developed to distinguish among and C ...

from the upper three spectra lets you determine whether a signal in a NMR spectrum is produced by a or CH carbon. Notice that a ...

PROBLEM 40 Identify pairs of coupled protons in 2-methyl-3-pentanone, using the COSY spectrum in Figure 14.39. 570 CHAPTER 14 NM ...

Section 14.21 Magnetic Resonance Imaging 571 cd a b 35 D 40 30 25 20 15 10 2.8 2.6 2.4 2.2 2.0 1.8 1.7 1.6 1.4 1.2 1.0 0.8 0.6 p ...

572 CHAPTER 14 NMR Spectroscopy An MRI may be taken in any plane, essentially independently of the patient’s posi- tion, allowin ...

Key Terms 573 Key Terms applied magnetic field (p. 527) chemically equivalent protons (p. 531) chemical shift (p. 533) NMR (p. 5 ...

574 CHAPTER 14 NMR Spectroscopy Problems How many signals are produced by each of the following compounds in its a. NMR spectr ...

Problems 575 87654 3210 c. frequency δ (ppm) 87654 3210 b. frequency δ (ppm) 87654 3210 a. frequency δ (ppm) ...

576 CHAPTER 14 NMR Spectroscopy Determine the ratios of the chemically nonequivalent protons in a compound if the steps of the ...

Problems 577 Identify each of the following compounds from the NMR data and molecular formula. The number of hydrogens responsi ...

578 CHAPTER 14 NMR Spectroscopy Compound A, with molecular formula shows two signals in its NMR spectrum. Compound B, an isomer ...

Problems 579 Would it be better to use NMR or NMR to distinguish among 1-butene,cis-2-butene, and 2-methylpropene? Explain your ...

580 CHAPTER 14 NMR Spectroscopy 2.6 2.7 2.8 2.9 3 3.5 4 4.5 5 5.5 6 7 8 9 10 11 12 13 14 15 16 380036003400320030002800260024002 ...