Organic Chemistry
9th Edition
ISBN: 9781305080485
Author: John E. McMurry
Publisher: Cengage Learning
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Chapter 13.SE, Problem 38AP
Predict the splitting pattern for each kind of hydrogen in the following molecules:
(a) (CH3)3CH
(b) CH3CH2CO2CH3
(C) trans-2-Butene
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The degree of unsaturation, or index of hydrogen
deficiency, is the number of pi bonds plus rings in a
molecule.
Specify the degree of unsaturation (index of hydrogen
deficiency) of the following formulas:
(a) C24H30
(b) C15H22
(c) C,H¡Cl,N
(a)
(b)
1. CH3MgBr
2. H3O+
H3C OH
I
H3C-C-C-CH3
H3C H
ОН
H
CH3
CH3
H3C CH3
H3C
H₂SO4
C=C
(a) Describe the molecular geometry expected for 1,2,3-butatriene (H2C=C=C=CH2). (b) Two stereoisomers are expected for 2,3,4-hexatriene (CH3CH=C=C=CHCH3). What should be the relationship between these two stereoisomers?
Chapter 13 Solutions
Organic Chemistry
Ch. 13.1 - Prob. 1PCh. 13.1 - Prob. 2PCh. 13.2 - Prob. 3PCh. 13.3 - The following 1H NMR peaks were recorded on a...Ch. 13.3 - When the 1Η NMR spectrum of acetone, CH3COCH3, is...Ch. 13.4 - Each of the following compounds has a single 1H...Ch. 13.4 - Identify the different types of protons in the...Ch. 13.5 - How many peaks would you expect in the 1H NMR...Ch. 13.6 - Predict the splitting patterns you would expect...Ch. 13.6 - Draw structures for compounds that meet the...
Ch. 13.6 - The integrated 1H NMR spectrum of a compound of...Ch. 13.7 - Identify the indicated sets of protons as...Ch. 13.7 - How many kinds of electronically nonequivalent...Ch. 13.7 - How many absorptions would you expect (S)-malate,...Ch. 13.8 - 3-Bromo-1-phenyl-1-propene shows a complex NMR...Ch. 13.9 - How could you use 1H NMR to determine the...Ch. 13.11 - Prob. 17PCh. 13.11 - Propose structures for compounds that fit the...Ch. 13.11 - Prob. 19PCh. 13.12 - Prob. 20PCh. 13.12 - Prob. 21PCh. 13.12 - Prob. 22PCh. 13.13 - Prob. 23PCh. 13.SE - Into how many peaks would you expect the 1H NMR...Ch. 13.SE - How many absorptions would you expect the...Ch. 13.SE - Sketch what you might expect the 1H and 13C NMR...Ch. 13.SE - How many electronically nonequivalent kinds of...Ch. 13.SE - Identify the indicated protons in the following...Ch. 13.SE - Prob. 29APCh. 13.SE - Prob. 30APCh. 13.SE - When measured on a spectrometer operating at 200...Ch. 13.SE - Prob. 32APCh. 13.SE - Prob. 33APCh. 13.SE - How many types of nonequivalent protons are...Ch. 13.SE - The following compounds all show a single line in...Ch. 13.SE - Prob. 36APCh. 13.SE - Propose structures for compounds with the...Ch. 13.SE - Predict the splitting pattern for each kind of...Ch. 13.SE - Predict the splitting pattern for each kind of...Ch. 13.SE - Identify the indicated sets of protons as...Ch. 13.SE - Identify the indicated sets of protons as...Ch. 13.SE - The acid-catalyzed dehydration of...Ch. 13.SE - How could you use 1H NMR to distinguish between...Ch. 13.SE - Propose structures for compounds that fit the...Ch. 13.SE - Propose structures for the two compounds whose 1H...Ch. 13.SE - Prob. 46APCh. 13.SE - How many absorptions would you expect to observe...Ch. 13.SE - Prob. 48APCh. 13.SE - How could you use 1H and 13C NMR to help...Ch. 13.SE - How could you use 1H NMR, 13C NMR, and IR...Ch. 13.SE - Assign as many resonances as you can to specific...Ch. 13.SE - Assume that you have a compound with the formula...Ch. 13.SE - The compound whose 1H NMR spectrum is shown has...Ch. 13.SE - The compound whose 1H NMR spectrum is shown has...Ch. 13.SE - Propose structures for compounds that fit the...Ch. 13.SE - Long-range coupling between protons more than two...Ch. 13.SE - The 1H and 13C NMR spectra of compound A, C8H9Br,...Ch. 13.SE - Propose structures for the three compounds whose...Ch. 13.SE - The mass spectrum and 13C NMR spectrum of a...Ch. 13.SE - Compound A, a hydrocarbon with M+=96 in its mass...Ch. 13.SE - Propose a structure for compound C, which has...Ch. 13.SE - Prob. 62GPCh. 13.SE - Propose a structure for compound E, C7H12O2, which...Ch. 13.SE - Compound F, a hydrocarbon with M+=96 in its mass...Ch. 13.SE - 3-Methyl-2-butanol has five signals in its 13C NMR...Ch. 13.SE - A 13C NMR spectrum of commercially available...Ch. 13.SE - Carboxylic acids (RCO2H) react with alcohols (ROH)...Ch. 13.SE - Prob. 68GPCh. 13.SE - The proton NMR spectrum is shown for a compound...Ch. 13.SE - The proton NMR spectrum of a compound with the...Ch. 13.SE - The proton NMR spectrum is shown for a compound...
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- The unsaturation number or degree of unsaturation (U) can be used to determine the number of rings and multiple bonds in a compound from its molecular formula. Given a structure, you can determine the number of hydrogens without having to count them explicitly. Consider three compounds and their degree of unsaturation. (a) A compound A has the molecular formula C7H13ClN2OC7H13ClN2O. How many rings and/or π bonds does it contain?arrow_forwardDraw the skeletal structures for these two molecules:arrow_forwardDraw structural formulas for the following compounds: (a) (2Z,4Z)-2,4-dibromo-3-methylhepta-2,4-diene (b) ((2E,4Z)-2-bromo-3,5-dichloro-4-methylhexa-2,4-dienearrow_forward
- Square planar molecules with formula AB2C2 and octahedral molecules with formulas AB4C2 and AB3C3 feature diastereoisomers. Recall that trigonal bipyramidal geometry features two distinct positions: axial and equatorial. Draw all diastereoisomers for trigonal bipyramidal molecules with formula (a) AB4C and (b) AB3C2. You must indicate the stereochemistry using full and dashed wedges and label all positions as either axial (ax) and equatorial (eq)..arrow_forwardWhich Newman projection corresponds to point A on the graph of potential energy vs. rotation about the C2-C3 bond?arrow_forwardDHA is a fatty acid derived from fish oil and an abundant fatty acid in vertebrate brains. Hydrogenation of DHA forms docosanoic acid [CH3(CH2)20CO2H], and ozonolysis forms CH3CH2CHO, CH2(CHO)2 (five equivalents), and HCOCH2CH2CO2H. What is the structure of DHA if all double bonds have the Z configuration?arrow_forward
- Propose structures for molecules that meet the following descriptions: (a) Contains two 〖sp〗^2-hybridized carbons and two 〖sp〗^3-hybridized carbons (b) Contains only four carbons, all of which are 〖 sp〗^2-hybridized (c) Contains two sp-hybridized carbons and two 〖sp〗^2-hybridized carbonsarrow_forwardCalculate the number of degrees of unsaturation for each molecular formula, and propose two possible structures: (a) C8H12; (b) C10H10.arrow_forwardThe pentadienyl radical, H2C“CH¬CH“CH¬CH2#, has its unpaired electron delocalized over three carbon atoms.(a) Use resonance forms to show which three carbon atoms bear the unpaired electron.(b) How many MOs are there in the molecular orbital picture of the pentadienyl radical?(c) How many nodes are there in the lowest-energy MO of the pentadienyl system? How many in the highest-energy MO?(d) Draw the MOs of the pentadienyl system in order of increasing energy. (continued)762 CHAPTER 15 Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy(e) Show how many electrons are in each MO for the pentadienyl radical (ground state).(f) Show how your molecular orbital picture agrees with the resonance picture showing delocalization of the unpairedelectron onto three carbon atoms.(g) Remove the highest-energy electron from the pentadienyl radical to give the pentadienyl cation. Which carbon atomsshare the positive charge? Does this picture agree with the resonance picture?(h) Add an…arrow_forward
- Draw the structures of 1,3-pentadiene and 1,4-pentadiene and label the carbons. Predict the trendin C-C single bond lengths in the two compounds.arrow_forwardFont Paragraph Predict the main organic product of the following reactions: (a) CH2-CHCHCH3 H*, H2O, heat CH3 (b) CH-СНСНСH3 Br2 CH3 (c) CH-CHCHСH3 (1) BH3 CH3 (2) H2О2, ОН-arrow_forwardPyrethrins, such as jasmolin II(below), are a group of naturalcompounds synthesized by flowers of the genus Chrysanthemum(known as pyrethrum flowers) to act as insecticides.(a) Circle and name the functional groups in jasmolin II.(b) What is the hybridization of the numbered carbons?(c) Which, if any, of the numbered carbons are chiral centers?arrow_forward
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