Organic Chemistry-Package(Custom)
4th Edition
ISBN: 9781259141089
Author: SMITH
Publisher: MCG
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Question
Chapter 7, Problem 7.65P
Interpretation Introduction
(a)
Interpretation:
To rank the given organic halides in order of increasing SN1 reactivity.
Concept introduction:
SN1 reaction is a unimolecular nucleophilic substitution reaction. It is a first-order kinetics and a two-step mechanism in which bond breaking occurs before bond making. The mechanism has two steps. Carbocations are formed as reactive intermediates. The Heterolysis of the C - Br bond forms an intermediate carbocation. This is the rate-determining step because it involves only bond cleavage. The nucleophilic attack the carbocation forms the new bond in the product.
Interpretation Introduction
(b)
Interpretation:
To rank the given organic halides in order of increasing SN1 reactivity.
Concept introduction:
SN1 reaction is a unimolecular nucleophilic substitution reaction. It is a first-order kinetics and a two-step mechanism in which bond breaking occurs before bond making. The mechanism has two steps. Carbocations are formed as reactive intermediates. The Heterolysis of the C - Br bond forms an intermediate carbocation. This is the rate-determining step because it involves only bond cleavage. The nucleophilic attack the carbocation forms the new bond in the product.
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Do you expect the following reaction to occur? Why?
Four isomers A-D with the formula C5H12O exhibit different reactivity patterns as indicated below.
Isomer A reacts with PCC and CrO3 to provide identical products.
Isomer B reacts with PCC and CrO3 to provide different products.
Isomers C and D do not react with either PCC or CrO3.
Isomers A, B, and C readily react with NaH but D does not show any reactivity with NaH.
The 1H NMR splitting patterns for these isomers are as follows.
Isomer A: δ 0.91 (d, 3H), 0.90 (d, 3H), 1.18 (d, 3H), 1.92 (dqq, 1H), 3.38 (dq, 1H), 3.58 (bs, 1H).
Isomer B: δ 1.25 (s, 9H), 3.45 (s, 2H), 3.65 (bs, 1H).
Isomer C: δ 0.90 (t, 3H), 1.44 (q, 2H), 1.24 (s, 6H), 3.65 (bs, 1H).
Isomer D: δ 1.10 (t, 3H), 1.13 (d, 6H), 3.19 (septet, 1H), 3.50 (q, 2H).
Based on all of this information, provide the structures of A-D. (Note: If there is a chiral center on any of these molecules, assume the stereochemistry as “R”. dqq=doublet of a quartet of a quartet, bs=broad singlet)
Consider a hypothetical chemical reaction between compound A and compound B, which produces compound C as the final product. The reaction is known to be exothermic and spontaneous. However, when the reaction is carried out under certain conditions, it fails to occur. Explain this observation and propose a potential solution to overcome this hurdle.
Chapter 7 Solutions
Organic Chemistry-Package(Custom)
Ch. 7 - Classify each alkyl halide as 1 , 2, or 3.Ch. 7 - Problem 7.1 Telfairine, a naturally occurring...Ch. 7 - Draw the structure of an alkyl bromide with...Ch. 7 - Give the IUPAC name for each compound. a. b. c. d.Ch. 7 - Prob. 7.5PCh. 7 - An sp3 hybridized CCl bond is more polar than an...Ch. 7 - Prob. 7.7PCh. 7 - Problem 7.6 Identify the nucleophile and leaving...Ch. 7 - Prob. 7.9PCh. 7 - Prob. 7.10P
Ch. 7 - Prob. 7.11PCh. 7 - Prob. 7.12PCh. 7 - Does the equilibrium favor the reactants or...Ch. 7 - Prob. 7.14PCh. 7 - Prob. 7.15PCh. 7 - Classify each solvent as protic or aprotic. a. b....Ch. 7 - Prob. 7.17PCh. 7 - Prob. 7.18PCh. 7 - Prob. 7.19PCh. 7 - Prob. 7.20PCh. 7 - Prob. 7.21PCh. 7 - Draw an energy diagram for the reaction in Problem...Ch. 7 - Draw the product of each SN2 reaction and indicate...Ch. 7 - Prob. 7.24PCh. 7 - Prob. 7.25PCh. 7 - What happens to the rate of an SN1 reaction under...Ch. 7 - Draw the products of each SN1 reaction and...Ch. 7 - Classify each carbocation as 1,2, or 3. a. b. c....Ch. 7 - Prob. 7.29PCh. 7 - Prob. 7.30PCh. 7 - Which alkyl halide in each pair reacts faster in...Ch. 7 - Prob. 7.32PCh. 7 - Problem 7.30 For each alkyl halide and...Ch. 7 - Prob. 7.34PCh. 7 - Prob. 7.35PCh. 7 - Prob. 7.36PCh. 7 - Prob. 7.37PCh. 7 - Prob. 7.38PCh. 7 - Prob. 7.39PCh. 7 - Prob. 7.40PCh. 7 - Prob. 7.41PCh. 7 - Give the IUPAC name for each compound, including...Ch. 7 - Draw the products formed when each alkyl halide is...Ch. 7 - Give the IUPAC name for each compound. a. c....Ch. 7 - Prob. 7.45PCh. 7 - Classify each alkyl halide in Problem 7.44 as 1 ,...Ch. 7 - Draw the eight constitutional isomers having the...Ch. 7 - Prob. 7.48PCh. 7 - Draw the substitution product that results when...Ch. 7 - Draw the products of each nucleophilic...Ch. 7 - Prob. 7.51PCh. 7 - Rank the species in each group in order of...Ch. 7 - Which of the following nucleophilic substitution...Ch. 7 - Prob. 7.54PCh. 7 - Prob. 7.55PCh. 7 - Prob. 7.56PCh. 7 - 7.53 Consider the following reaction.
Draw a...Ch. 7 - Prob. 7.58PCh. 7 - Prob. 7.59PCh. 7 - Draw the products of each SN2 reaction and...Ch. 7 - Prob. 7.61PCh. 7 - Prob. 7.62PCh. 7 - Prob. 7.63PCh. 7 - Consider the following SN1 reaction. a.Draw a...Ch. 7 - Prob. 7.65PCh. 7 - Prob. 7.66PCh. 7 - Draw the products of each SN1 reaction and...Ch. 7 - Prob. 7.68PCh. 7 - Prob. 7.69PCh. 7 - Diphenhydramine, the antihistamine in Benadryl,...Ch. 7 - Draw a stepwise, detailed mechanism for the...Ch. 7 - When a single compound contains both a nucleophile...Ch. 7 - Prob. 7.73PCh. 7 - Prob. 7.74PCh. 7 - Draw a stepwise, detailed mechanism f or the...Ch. 7 - Prob. 7.76PCh. 7 - Fill in the appropriate reagent or starting...Ch. 7 - Devise a synthesis of each compound from an alkyl...Ch. 7 - Prob. 7.79PCh. 7 - Suppose you have compounds A-D at y our disposal....Ch. 7 - Prob. 7.81PCh. 7 - Prob. 7.82PCh. 7 - Prob. 7.83PCh. 7 - Prob. 7.84PCh. 7 - 7.80 As we will learn in Chapter 9, an epoxide is...Ch. 7 - Prob. 7.86PCh. 7 - In some nucleophilic substitutions under SN1...
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