Organic Chemistry-Package(Custom)
4th Edition
ISBN: 9781259141089
Author: SMITH
Publisher: MCG
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Chapter 14, Problem 14.39P
Acetone exhibits a singlet in its 1H NMR spectrum at 2.16 ppm. If CH2Cl2 exhibits a singlet 1570 Hz downfield from acetone on a 500 MHz NMR spectrometer, what is the chemical shift of the singlet due to CH2Cl2?
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The 1H NMR spectrum of 1,2-dimethoxyethane (CH3OCH2CH2OCH3) recorded on a 300 MHz NMR spectrometer consists of signals at 1017 Hz and 1065 Hz downfield from TMS.(a) Calculate the chemical shift of each absorption.
(b) At what frequency would each absorption occur if the spectrum were recorded on a 500 MHz NMR spectrometer?
The 1H NMR spectrum of 1,2-dimethoxyethane (CH3OCH2CH2OCH3) recorded on a 300 MHz NMR spectrometer consists of signals at 1017 Hz and 1065 Hz downeld from TMS. (a) Calculate the chemical shift of each absorption. (b) At what frequency would each absorption occur if the spectrum were recorded on a 500 MHz NMR spectrometer?
Which compound gives a signal in the 1H-NMR spectrum with a larger chemical shift, furan or cyclopentadiene? Explain.
Chapter 14 Solutions
Organic Chemistry-Package(Custom)
Ch. 14 - Problem 14.1 The NMR spectrum of recorded on a ...Ch. 14 - Prob. 14.2PCh. 14 - How many 1H NMR signals does each compound show?Ch. 14 - How many 1H NMR signals does each...Ch. 14 - Label the protons in each highlighted CH2 group as...Ch. 14 - How many 1H NMR signals would you expect for each...Ch. 14 - Prob. 14.7PCh. 14 - For each compound, first label each different type...Ch. 14 - Prob. 14.9PCh. 14 - Which compound give a 1H NMR spectrum with two...
Ch. 14 - Prob. 14.11PCh. 14 - Prob. 14.12PCh. 14 - Prob. 14.13PCh. 14 - For each compound give the number of 1H NMR...Ch. 14 - Prob. 14.15PCh. 14 - Prob. 14.16PCh. 14 - Describe the 1H NMR spectrum of each compound....Ch. 14 - Draw a splitting diagram for Hb in...Ch. 14 - Problem 14.20 Identify A and B, isomers of...Ch. 14 - Problem 14.21 How many signals are present in the ...Ch. 14 - What protons in alcohol A give rise to each signal...Ch. 14 - How many peaks are observed in the NMR signal for...Ch. 14 - Propose a structure for a compound of molecular...Ch. 14 - Problem 14.25 Propose a structure for a compound...Ch. 14 - Problem 14.26. Identify products A and B from the...Ch. 14 - How many lines are observed in the 13C NMR...Ch. 14 - Problem 14.28 Draw all constitutional isomers of...Ch. 14 - Esters of chrysanthemic acid are naturally...Ch. 14 - Prob. 14.29PCh. 14 - Problem 14.31 Identify the carbon atoms that give...Ch. 14 - Problem 14.32 A compound of molecular formula ...Ch. 14 - Problem 14.33 Draw the structure of a compound of...Ch. 14 - 14.34 (a) How many NMR signals does each of the...Ch. 14 - 14.35 (a) How many NMR signals does each compound...Ch. 14 - How many different types of protons are present in...Ch. 14 - How many 1H NMR signals does each compound give?...Ch. 14 - 14.37 How many NMR signals does each natural...Ch. 14 - Prob. 14.38PCh. 14 - Acetone exhibits a singlet in its 1H NMR spectrum...Ch. 14 - Prob. 14.40PCh. 14 - Prob. 14.41PCh. 14 - How could you use chemical shift and integration...Ch. 14 - Which compounds give one singlet in the 1H NMR...Ch. 14 - Prob. 14.44PCh. 14 - 14.43 How can you use NMR spectroscopy to...Ch. 14 - Prob. 14.46PCh. 14 - Prob. 14.47PCh. 14 - Which compounds in Problem 14.43 give one signal...Ch. 14 - Prob. 14.49PCh. 14 - How many 13C NMR signals does each compound...Ch. 14 - Rank the highlighted carbon atoms in each compound...Ch. 14 - 14.50 Identify the carbon atoms that give rise to...Ch. 14 - 14.51 a. How many signals does dimethyl...Ch. 14 - 14.53 Propose a structure consistent with each set...Ch. 14 - 14.54 Identify the structures of isomers A and B...Ch. 14 - 14.55 Reaction of with affords compound W,...Ch. 14 - 14.56 Treatment of with , followed by aqueous
...Ch. 14 - 14.57 Compound C has a molecular ion in its mass...Ch. 14 - 14.58 As we will learn in Chapter 20, reaction of ...Ch. 14 - 14.59 Identify the structures of isomers E and F...Ch. 14 - 14.59 Identify the structures of isomers H and I...Ch. 14 - 14.61 Propose a structure consistent with each set...Ch. 14 - 14.62 Reaction of with , followed by treatment...Ch. 14 - Reaction of aldehyde D with amino alcohol E in the...Ch. 14 - 14.64 Propose a structure consistent with each set...Ch. 14 - 14.65 In the presence of a small amount of acid, a...Ch. 14 - 14.66 Treatment of with affords two products (M...Ch. 14 - 14.67 Compound O has molecular formula and shows...Ch. 14 - 14.68 Compound P has molecular formula . Deduce...Ch. 14 - 14.69 Treatment of with strong base followed by ...Ch. 14 - Low molecular weight esters RCO2R often have...Ch. 14 - 14.70 When -bromo--dimethylbutane is treated with...Ch. 14 - 14.71 Propose a structure consistent with each set...Ch. 14 - 14.72 Reaction of unknown A with forms...Ch. 14 - Prob. 14.75PCh. 14 - 14.74 -Annulene shows two signals in its ...Ch. 14 - 14.75 Explain why the spectrum of-methylbutan--ol...Ch. 14 - 14.76 Because has an odd mass number, nuclei...Ch. 14 - 14.77 Cyclohex--enone has two protons on its...
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